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Legalism (or nomism), in Messianic/Christian theology, is the act of putting the Law of Moses above the gospel, which is 1 Corinthians 15:1-4, by establishing requirements for salvation beyond faith (trust) in Jesus Christ, specifically, trust in His finished work - the shedding of His blood for our sins, and reducing the broad, inclusive, and general precepts of the Bible to narrow and rigid moral codes. It is an over-emphasis of discipline of conduct, or legal ideas, usually implying an allegation of misguided rigour, pride, superficiality, the neglect of mercy, and ignorance of the grace of God or emphasizing the letter of law at the expense of the spirit. Legalism is alleged against any view that obedience to law, not faith in God's grace, is the pre-eminent principle of redemption. On the viewpoint that redemption is not earned by works, but that obedient faith is required to enter and remain in the redeemed state, see covenantal nomism.
In the New Testament
The words 'legalism' or 'legalist' are not used in most english versions Old or New Testaments. Legalism's root word, "law" (Greek nomos), occurs frequently in the New Testament, and sometimes is interpreted as legalism. In 1921, Ernest De Witt Burton stated that in Gal. 2:16, "nomou is here evidently used ... in its legalistic sense, denoting divine law viewed as a purely legalistic system made up of statutes, on the basis of obedience or disobedience to which individuals are approved or condemned as a matter of debt without grace. This is divine law as the legalist defined it." The Greek of Paul's day lacked any term corresponding to the distinct position of "legalism", "legalist", or "legalistic", leading C.E.B. Cranfield to commend "the possibility that Pauline statements which at first sight seem to disparage the law, were really directed not against the law itself but against that misunderstanding and misuse of it for which we now have a convenient terminology" (legalism). Messianic Jewish Bible translator David H. Stern cited these two scholars to support the translation framework that often "'nomos' means 'legalism' and not God's Torah", especially in Paul's constructs erga nomou (literally "works of law", rendered by Stern "legalistic observance of Torah commands") and upo nomon (literally "under law", rendered by Stern by 13 words, "in subjection to the system which results from perverting the Torah into legalism").
One concept of legalism, the belief that salvation can be earned by obedience to laws, is referred to in various New Testament books, including Galatians. In this case, some Jews who had become Christians believed that obedience to the Mosaic laws were required to be saved, such as the cases of the circumcision controversy and the Incident at Antioch. Generally, however, these cases are referred by some Gentile Believers as the Judaizer controversy.
Legalism refers to any doctrine which states salvation comes strictly from adherence to the law. It can be thought of as a works-based religion. Groups in the New Testament said to be falling into this category include the Pharisees, Sadducees, Scribes, Judaizers, and Nicolaitans. They are legalists because they emphasized obeying the Law of Moses, in the case of the Pharisees and Scribes, to the letter without understanding the concept of grace. Jesus condemned their legalism in Matthew 23. The Pharisees love of the praises of men for their strict adherence is said to be a prime example of legalism.
Legalism is sometimes confused with obedience. New Testament books such as Romans, speak of grace and obedience together. An example is found in Romans 1:5 (New American Standard Version) speaking of Christ 'through whom we have received grace and apostleship to bring about the obedience of faith among all the Gentiles, for His name's sake...' The goal of receiving the grace was to bring about obedience of faith. Here grace, faith and obedience are tied together. Other references are in Acts 5:29, 32; Romans 16:19; 2 Corinthians 7:15; Hebrews 5:9.
Legalism is also confused with discipline, which is often spoken of in a positive light. See 1 Corinthians 9:17; 1 Timothy 4:7; 2 Timothy 1:7 and Hebrews 12:5–11.
A third common misunderstanding of legalism is the word law. Law in many places in the Bible refers to the Law of Moses, see also Biblical law in Christianity. In Galatians the Judaizers were trying to insist that salvation required that a person be circumcised prior to obeying the Law of Christ. Galatians 2:16 says, "Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified" (King James Version). The faith here is the Law of Christ and the law here is the Law of Moses. The legalism of the Judaizers was that obedience to the law of Moses was necessary to be saved.
Legalism in the New Testament is believed by some as being revealed by the life of Saul prior to his changing. Some believe that Saul sought to redeem himself by his works of persecution of the church and its ultimate destruction. Acts 26:9–11 (King James Version) reveals, "I verily thought with myself, that I ought to do many things contrary to the name of Jesus of Nazareth. Which thing I also did in Jerusalem: and many of the saints did I shut up in prison, having received authority from the chief priests; and when they were put to death, I gave my voice against them. And I punished them oft in every synagogue, and compelled them to blaspheme; and being exceedingly mad against them, I persecuted them even unto strange cities" (King James Version). Galatians 1:13-14 Complete Jewish Bible states, 13 For you have heard about my former way of life in [traditional] Judaism — how I did my best to persecute God’s Messianic Community and destroy it; 14 and how, since I was more of a zealot for the traditions handed down by my forefathers than most Jews my age, I advanced in [traditional] Judaism more rapidly than they did. These two texts emphasize the legalistic perspective Paul hads before he changed.
However, in this passage the obedience is not tied to the obeying of specific Old Testament laws, such as keeping Sabbath or circumcision.
- "Wherefore my sentence is, that we trouble not them, which from among the Gentiles are turned to God: But that we write unto them, that they abstain from pollutions of idols, and [from] fornication, and [from] things strangled, and [from] blood. For Moses of old time hath in every city them that preach him, being read in the synagogues every Sabbath day" (Acts 15:19–21).
Though the Apostolic Decree is no longer observed by many Christian denominations today, it is still observed in full by the Greek Orthodox. and it was a very effective philosophy during that time.
In intra-Christian relations
Roman Catholic Church
In Roman Catholicism, good works are done in service to God and one's neighbour, by faith working through love. In contrast, a severity in the imposition of, or overly scrupulous conformity to any rule of piety, may be charged with legalism.
In an attempt to resolve the dispute over legalism, the Joint Declaration on the Doctrine of Justification was a document issued in 1999 by Lutheran-Catholic clerical representatives, declaring a common belief in Sola gratia, that grace alone can save the faithful, and that there is a progressive infusion of grace in the spirit of the believer.
Eastern Orthodox Churches
The Eastern Orthodox, for another example, rejects the satisfaction theory of the atonement as legalistic. The satisfaction theory states that mankind's Original Sin violated God's law, resulting in all men being born guilty: an idea prevalent in the writings of Tertullian and Augustine of Hippo of the Western Church. Anselm formally developed the theory that the legal problem of guilt before the Law, required the legal solution of retribution, in order to achieve a just salvation. The solution was for God's son Jesus to willingly die on the Cross in place of humanity, thus allowing the legal penalty to be fully carried out, satisfying the justice of God, and thus clearing the way for mercy to be shown to sinners. The Eastern Orthodox charge that this theory is too dependent upon Roman legal concepts of retribution and justice. 
In Protestant, Evangelical, Christian theology, especially in popular versions of the same, the charge of legalism is an accusation of overzealous adherence to the word of the Bible (as law) in all things said, established or accomplished in a believer's life (cf. bibliolatry). In that context, to apply the criticism of legalism to a theological position or religious attitude implies that the accused has overturned the Gospel of salvation through faith and new life in Jesus Christ and has instead substituted some principle of personal works of strict adherence to the word, through action, thought, or speech for the unearned grace of God.
- Asceticism, such as fasting and other forms of self-denial.
- The keeping of Christian Sabbath, especially regarding prohibitions of various otherwise innocent activities on the day of worship.
- Various extra-biblical ordinances and customs that become associated not just with wisdom but with holiness, in the contemporary situation, such as prohibitions against theater, movies, dancing, rock music, playing cards, interracial marriage or mixed bathing.
- Total abstinence from alcohol (See also Christianity and alcohol.)
- Ritualism, a superficial or superstitious use of customary prayers and liturgy.
- Similarly, certain exclusive ritual practices, such as rigorous insistence on the tetragrammaton as the only name by which God is honored, dietary laws, Saturday Sabbath, or Passover (Christian holiday), especially when practicing these rituals is held necessary for salvation.
- Sacraments, especially when the underlying theology allegedly views them as communicating God's grace automatically (compare ex opere operato).
- Various rigorous and restrictive beliefs, such as that, only the King James Version of the Bible constitutes God's word.
- The belief that Christian families should homeschool.
- The belief that women should never wear pants or shorts.
- Christian Reconstructionism, which is based on the belief that Christians should still obey and enforce the full Mosaic law.
Several underlying dynamics appear in these controversies. The permitted scope of veneration of material objects versus claims that such veneration is idolatry, affects the perceived sanctity of ritual spaces and objects, and therefore of the rituals and customs themselves. Teachings about the authority of the church, the sources of legitimacy of that authority, and the role of clergy versus the priesthood of all believers, also affect these debates.
- Daniel G. Reid et al., Dictionary of Christianity in America (Downers Grove, IL: InterVarsity Press, 1990)
- Burton, Ernest De Witt, The International Critical Commentary, Galatians, 1921, p. 120.
- Cranfield, C.E.B., The International Critical Commentary, Romans, 1979, p. 853.
- Stern, David H., Jewish New Testament Commentary, 1992, pp. 535–8, 552–3, on Gal. 2:16b, 3:23b.
- Karl Josef von Hefele's commentary on canon II of Gangra notes: "We further see that, at the time of the Synod of Gangra, the rule of the Apostolic Synod with regard to blood and things strangled was still in force. With the Greeks, indeed, it continued always in force as their Euchologies still show. Balsamon also, the well-known commentator on the canons of the Middle Ages, in his commentary on the sixty-third Apostolic Canon, expressly blames the Latins because they had ceased to observe this command. What the Latin Church, however, thought on this subject about the year 400, is shown by St. Augustine in his work Contra Faustum, where he states that the Apostles had given this command in order to unite the heathens and Jews in the one ark of Noah; but that then, when the barrier between Jewish and heathen converts had fallen, this command concerning things strangled and blood had lost its meaning, and was only observed by few. But still, as late as the eighth century, Pope Gregory the Third (731) forbade the eating of blood or things strangled under threat of a penance of forty days. No one will pretend that the disciplinary enactments of any council, even though it be one of the undisputed Ecumenical Synods, can be of greater and more unchanging force than the decree of that first council, held by the Holy Apostles at Jerusalem, and the fact that its decree has been obsolete for centuries in the West is proof that even Ecumenical canons may be of only temporary utility and may be repealed by disuse, like other laws."
- Cf. the article/interview "Il legalismo? Parliamone (Legalism? Let's talk about it)", with the participation of Nicola Martella, Alessandro Ceralli, Silvano Creaco, et al. (in Italian)
- Cf. int. al., Beacham, Roy E.; Kevin T. Bauder, One Bible Only? Examining Exclusive Claims for the King James Bible, Kregel Publications, 2001.
- Cf. "The Protestant Heritage" Encyclopædia Britannica (2007), Encyclopædia Britannica Online, 20/09/2007: "Protestantism originated in the 16th-century Reformation, and its basic doctrines, in addition to those of the ancient Christian creeds, are justification by grace alone through faith, the priesthood of all believers, and the supremacy of Holy Scripture in matters of faith and order."