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|Born||827 CE, Tahirid dynasty|
|Died||911 CE, Saffarid dynasty|
|Influenced by||Socrates, Epicurus, Theodorus the Atheist|
|Influenced||Al-Maʿarri, Turan Dursun|
Abu al-Hasan Ahmad ibn Yahya ibn Ishaq al-Rawandi (Persian: ابو الحسن احمد بن یحیی بن اسحاق راوندی, Arabic: أبو الحسن أحمد بن يحيى بن إسحاق الراوندي), commonly known as Ibn al-Rawandi (Persian: ابن راوندی; born 827 CE–died 911 CE), was an early skeptic of Islam and a critic of religion in general. In his early days he was a Mutazilite scholar, but after rejecting the Mutazilite doctrine he adhered to Shia Islam for a brief period and later became a freethinker who repudiated Islam and revealed religion. Though none of his works survived, his opinions had been preserved through his critics, and the surviving books that answered him. The book with the most preserved fragments (through an Ismaili book refuting Al-Rawandi's ideology), is the Kitab al-Zumurrud (The Book of the Emerald).
Abu al-Husayn Ahmad bin Yahya ben Isaac al-Rawandi was born in Rawand in Kashan, today located in Central Iran or some say in Marv-rud in Greater Khorasan, today located in northwest Afghanistan, about the year 815 CE. According to the Egyptian scholar Abdur Rahman Badawi, Al-Rawandi was born in Basra at the time of the Abbassid Caliph Al-Mamoun. His father, Yahya, was a Jewish scholar and convert to Islam, who schooled Muslims in how to refute the Talmud. Al-Rawandi abandoned Islam for atheism and used his knowledge of Islam, learned from his father, to refute the Quran. Al-Rawandi is reviled by Muslims as a result of polemics he authored against all religions.
He joined the Mu'tazili of Baghdad, and gained prominence among them. But then he became estranged from his fellow Mutazilites, and formed close alliances with Shia Muslims and then with non-Muslims (Manichaeans, Jews and perhaps also Christians). He then became a follower of the Manichaean heretic, Muhammad al Warraq in which he wrote several books that criticized revealed religion.
It is generally agreed among Muslims that Ibn al-Rawandi was indeed a heretic, but there is no agreement as to the nature of his heresy. Some look for the roots of his heresy in his connections with Shi'ism, and depict him as a Mutazilite gone wild. Some regard him as an Aristotelian philosopher, while others see him as a radical atheist, and some stress the political challenge he presented to the Islamic polity.
At the same time, scholars try to account for the more positive view of Ibn al-Rawandi in some Muslim sources. Josef van Ess in particular has suggested an original interpretation that aims at accommodating all the contradictory information. Van Ess notes that the sources which portray Ibn al-Rawandi as a heretic are predominantly Mutazilite and stem from Iraq, whereas in eastern texts he appears in a more positive light. As an explanation for this difference, van Ess suggests "a collision of two different intellectual traditions," i.e., those in Iran and in Iraq. He further suggests that Ibn al-Rawandi's notoriety was the result of the fact that after Ibn al-Rawandi left Baghdad, "his colleagues in Baghdad ... profiting from his absence ... could create a black legend." In other words, van Ess believes that Ibn al-Rawandi, although admittedly eccentric and disputatious, was not a heretic at all.
He rejected the authority of any scriptural or revealed religion. This is borne out by citations from his other writings, besides the Kitab al-Zumurrud and The Futility of (Divine) Wisdom (Abath al-hikma).
Subjects discussed in the Kitab al-Zumurrud 
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Primacy of the intellect 
God has bestowed upon human beings the gift of intellect, by which they can judge right and wrong. If what the prophets announce corresponds to what the intellect decrees, then prophets are superfluous. If it contradicts what the intellect decrees, then one should not listen to them.(132) The discussion with the Barahima, the issue of the abrogation of the law, and the question of the possibility of substituting one law for another are also part of this argument.(133) The argument is then applied to Islam in particular.(134)
Connected with the claim of the sufficiency of human intellect is the discussion of various expressions of this intellect.(135) Human children are taught to speak by their parents, from one generation to another, and this has always been the case.(136) Ibn al-Rawandi is here probably addressing the question of whether human speech is natural or conventional. He seems to favor the solution of ilham (i.e., natural, innate knowledge), although the term itself does not appear. From the dai's answer we can see that Ibn al-Rawandi gave various examples of innate knowledge (the ability of birds to communicate with each other, the ability of ducks to swim, the ability of infants to suck milk), and that these were mentioned by him as being analogous to speech and understanding.
The sciences are also mentioned by Ibn al-Rawandi as proof for the sufficiency of the intellect. According to him, people developed the science of astronomy by watching the skies. They did not need a prophet to teach them how to watch. Nor did they need prophets in order to teach them how to build lutes. It is absurd to assume that without prophetic revelation people would not have learned that the intestines of a sheep, when dried and stretched upon a piece of wood, can produce pleasant tones. All these skills are acquired by the assiduous application of the inborn human intellect, discernment, and power of observation.
Paul Kraus thought that this part of the book opened with a paragraph praising the intellect in rhymed prose, one sentence of which is to be found in the dai's refutation.(137) Kraus noted that neither the dai nor Ibn al-Rawandi were given to writing rhymes. He argued that the only place one could expect either one of them to use such a sentence would be in an opening chapter of a conventional nature, where the praise of the intellect is sung before the real discussion begins. He therefore suggested that the Zumurrud had a poetic opening in which Ibn al-Rawandi glorified the intellect, and that the dai opened his response with a poetic paraphrase of Ibn al-Rawandi's verse.(138)
It is indeed possible that this sentence is taken from an introduction written in flowery style. It is not supposed, however, that it could come from Ibn al-Rawandi's pen. Had this been the case, the dai would probably have said so explicitly, as he always does when he wants to attack something said by Ibn al-Rawandi. It is more likely that this sentence was written by the dai.(139) Furthermore, in the debate with the Kitab al-Zumurrud the proper estimate of the role of the intellect was not a side-issue, but stood at the core of the discussion. It is therefore likely that, rather than being a conventional opening, the reference to "the person who claims to cover the horizons of science with the wings of the intellect" is the dai's direct assault on Ibn al-Rawandi's intellectualist pretensions.
Muslim traditions 
According to the Zumurrud, traditions concerning miracles are inevitably problematic. At the time of the performance of a supposed miracle only a small number of people could be close enough to the Prophet to observe his deeds. Reports given by such a small number of people cannot be trusted, for such a small group can easily have conspired to lie.(144) The Muslim tradition thus falls into the category of flimsy traditions, those based on a single authority (khabar al-ahad) rather than on multiple authorities (khabar mutawatir).(145) These religious traditions are lies endorsed by conspiracies.
The Zumurrud points out that Muhammad's own presuppositions (wad) and system (qanun) (146) show that religious traditions are not trustworthy. The Jews and Christians say that Jesus really died, but the Quran contradicts them.(147)
Ibn al-Rawandi also points out specific Muslim traditions, and tries to show that they are laughable. The tradition that the angels rallied round to help Muhammad is not logical, because it implies that the angels of Badr were weaklings, able to kill only seventy of the Prophet's enemies. And if the angels were willing to help Muhammad at Badr, where were they at Uhud, when their help was so badly needed?(148)
Muslim rituals 
The Zumurrud criticizes prayer, preoccupation with ritual purity, and the ceremonies of the hajj: throwing stones, circumambulating a house that cannot respond to prayers, running between stones that can neither help nor harm. It goes on to ask why Safa and Marwa are venerated, and what difference there is between them and any other hill in the vicinity of Mecca, for example the hill of Abu Qubays, and why the Kaaba is any better than any other house.(153)
This sketch of the arguments contained in the Zumurrud confirms several of the conclusions presented in previous sections of the present study. It shows the close similarity between the Majalis Muayyadiyya, Maturidi, and the Tathbit, and thus corroborates the claim that they derive from the same source, the Zumurrud. It also strengthens the impression that all three sources summarize rather than quote the Zumurrud. And it shows that none of the three sources relied on either of the other two for its information, since in each one of them we find elements that are lacking in the other two. A comparison of the sources allows us to see that the same arguments are attributed at times to Ibn al-Rawandi, at times to al-Warraq and at times to both of them. A correct understanding of the Zumurrud must allow for the active participation of both Ibn al-Rawandi and al-Warraq in the dialogue, and take into account the heretical convictions of both of them.
From the Encyclopaedia of Islam:
"The plentiful extracts from the K. al-Zumurraudh provide a fairly clear indication of the most heterodox doctrine of Ibn al-Rawandi, that of which posterity has been least willing to forgive him: a biting criticism of prophecy in general and of the prophecy of Muhammad in particular; he maintains in addition that religious dogmas are not acceptable to reason and must, therefore, be rejected; the miracles attributed to the Prophets, persons who may reasonably be compared to sorcerers and magicians, are pure invention, and the greatest of the miracles in the eyes of orthodox Muslims, the Quran, gets no better treatment: it is neither a revealed book nor even an inimitable literary masterpiece. In order to cloak his thesis, which attacks the root of all types of religion, Ibn al-Rawandi used the fiction that they were uttered by Brahmans. His reputation as irreligious iconoclast spread in the 4th/10th century beyond the borders of Muslim literature."
- Al-Zandaqa Wal Zanadiqa, by Mohammad Abd-El Hamid Al-Hamad , First edition 1999, Dar Al-Taliaa Al-Jadida, Syria (Arabic)
- A History of Natural Philosophy By Edward Grant
- Min Tareekh Al-Ilhad Fi Al-Islam, From the History of Atheism in Islam by Abd-El Rahman Badawi pages: 87-206, Second edition 1991, Sinaa Lil Nasher Egypt (Arabic)
- Routledge Encyclopedia of Philosophy: Genealogy to Iqbal Page 636
- On Ibn al-Rawandi, from the Encyclopaedia of Islam, 1971, Volume 3, E J Brill, Leiden, p 905
- The blinding emerald: Ibn al-Rawandi's 'Kitab al-Zumurrud.'
- İşte 1.000 yıl önceki Turan Dursun in Turkish.