Matthew 5:48 is the forty-eighth and final verse of the fifth chapter of the Gospel of Matthew in the New Testament and is part of the Sermon on the Mount. This is the final verse of the final antithesis, and it is a summary of Jesus' earlier teachings.
- Be ye therefore perfect, even as your
- Father which is in heaven is perfect.
The World English Bible translates the passage as:
- Therefore you shall be perfect, just
- as your Father in heaven is perfect.
The formulation is this verse is known as the Imitatio Dei; a similar verse appears at Luke 6:36. The verse might be modeled on Leviticus 19:2, which says in the King James: "Speak unto all the congregation of the children of Israel, and say unto them, You shall be holy: for I the LORD your God am holy." 
There is some debate about the meaning of the injunction to be "perfect," since orthodox Christianity teaches that creatures cannot achieve God's level of perfection.
The term rendered "perfect" in most English translations is τέλειοι (teleioi), the same word used in the Septuagint for תָּמִים and meaning "brought to its end, finished; lacking nothing necessary to completeness.". According to Barnes, "Originally, it is applied to a piece of mechanism, as a machine that is complete in its parts. Applied to people, it refers to completeness of parts, or perfection, where no part is defective or wanting."  Some link the Gospel's use of the term with its use by the Greek philosophers. To them something was perfect if it fully be its intended function.
One commentary offers, "Manifestly, our Lord here speaks, not of degrees of excellence, but of the kind of excellence which was to distinguish His disciples and characterize His kingdom. When therefore He adds, even as your Father which is in heaven is perfect—He refers to that full-orbed glorious completeness which is in the great Divine Model, 'their Father which is in heaven.'"  Other scholars believe that Jesus is here setting a goal that is certain to be impossible, so that we will realize this and be humble. The pursuit of perfection is important, even if the attainment of it impossible.
Another view is that this is a limited form of perfection that is being asked. Fowler notes that elsewhere in the New Testament, it is stated that those who believe in Jesus and rely fully upon him for all things is perfect. In Jewish scripture certain individuals such as Abraham and Noah are referred to as perfect because of their obedience to God. In these passages perfect is used as a synonym for complete, and perfect obedience to God is simply complete obedience to God. Barclay argues that the previous verses made clear that man's function is to love, and anyone who does that absolutely can be considered perfect. Similarly, Gill notes that "this perfection is to be restrained to the subject Christ is upon, love to men, and not to be referred to any, or every other thing."  The Qumran followers described themselves as the followers of the "perfect way," in that they were followers of what they believed was perfect dedication to God.
The Cambridge Bible for Schools and Colleges synthesizes several approaches:
- Either (1) in reference to a future state, “if ye have this true love or charity ye shall be perfect hereafter;” or (2) the future has an imperative force, and perfect is limited by the preceding words = perfect in respect of love, i. e. “love your enemies as well as your neighbours,” because your Father being perfect in respect of love does this.
- For a collection of other versions see BibleHub Matthew 5:48
- Leviticus 19:2 KJV
- Thayer's Greek Lexicon entry for Strong's NT #5046.
- Barnes' Notes on the Bible, Matthew 5:48.
- Jamies-Fausset-Brown Bible Commentary, Matthew 5:48.
- Morris, Leon. The Gospel According to Matthew. Grand Rapids: William B. Eerdmans, 1992.
- Barclay, William. The Gospel of Matthew: Volume 1 Chapters 1-10. Edinburgh: Saint Andrew Press, 1975.
- Gill's Exposition of the Entire Bible
- Fowler, Harold. The Gospel of Matthew: Volume One. Joplin: College Press, 1968
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