Imam Ali (peace be upon him): One of the zindiqs (heretics) came to the Commander of the Faithful (peace be upon him) and said: "Were it not for the contradictions and inconsistencies in the Qur'an, I would certainly have accepted Islam!" Ali (peace be upon him) said: "What contradiction is there in the Qur'an?" He said: "The names of the deceivers, the misguided, and those who misguide others are mentioned in the Qur'an, but in the verses: یَوْمَ یَعَضُّ الظَّالِمُ عَلی یَدَیْهِ یَقُولُ یا لَیْتَنِی اتَّخَذْتُ مَعَ الرَّسُولِ سَبِیلًا * یا وَیْلَتی لَیْتَنِی لَمْ أَتَّخِذْ فُلاناً خَلِیلًا * لَقَدْ أَضَلَّنِی عَنِ الذِّکْرِ بَعْدَ إِذْ جاءَنِی [The day when the wrongdoer will bite his hands, saying: "Would that I had taken a path with the Messenger! Woe to me! Would that I had not taken so-and-so as a friend! Indeed, he led me astray from the Reminder after it had come to me"], it is mentioned by way of allusion (kinaya) and the name is not given, while in contrast the names of so many prophets (peace be upon them) are mentioned in the Qur'an." Ali (peace be upon him) said: "The instances in which the Qur'an explicitly names individuals, and the instances in which the wrongdoing criminals are alluded to indirectly — while the Qur'an itself testifies to their wrongdoing — is among the strongest proofs of the wisdom of Allah, His overwhelming power, and His manifest might. For Allah knows that the arguments of the prophets (peace be upon them) weighed heavily upon their peoples, since we see that in earlier communities some individuals took the prophets (peace be upon them) themselves as objects of worship — like the Christians, who called Isa ibn Maryam (peace be upon him) Allah or the son of Allah. This shows how people failed to reach the perfection they could have attained in the shade of accepting the tawhid of Allah, the Mighty and Majestic. [But it did not happen so] ... Thus mentioning the names of the prophets (peace be upon them) was not out of arrogance nor out of honouring them, but only to make them known to the people of insight. As for alluding to the possessors of great sins such as the hypocrites, that is not the act of Allah, but the act of those who altered [the Qur'an] — those who divided the Qur'an [accepting what suited them and abandoning what went against their desires]! (Hijr/91), and who took their worldly share by means of the religion... After the Messenger of Allah (peace be upon him and his family) departed from this world, some individuals treated the Qur'an as the Jews and Christians had treated the Torah and the Gospel after the loss of Musa and Isa (peace be upon them) — adding to them and distorting them. Their aim was to extinguish the light of Allah with their mouths, but Allah refuses anything but to complete His light. (Tawba/32) For this reason they wrote things in the Book that Allah had [not] said, intending to conceal the truth from the people. Allah blinded their hearts, and they left behind them a trace that indicates their falsehoods, their obscuring of matters, and their concealment — concerning which Allah said to them: "Why do you mix truth with falsehood?" (Al Imran/71) And He gives a parable of them thus: "As for the foam, it is cast off as scum, and as for that which benefits the people, it remains in the earth." (Ra'd/17) The "foam" here means the speech of the opponents which they added to the Qur'an; Allah made it vanish, void and disintegrated, while the hearts accept [what is true]. The word "earth" in فَیَمْکُثُ فِی الْأَرْضِ [it remains in the earth] refers to the position and abode of knowledge. It is not permissible, given the evidences of tafsir, to make explicit reference to the names of the alterers and to the verses added by them into the Book. That is because it would strengthen the arguments of the opponents, the disbelievers, and the communities that have deviated from our religion and qibla, and on the other hand it would cause the loss of trust in a Book that is accepted by all. It must be noted that the people of falsehood have always been more numerous than the people of truth, and for this very reason patience under tyrannical rulers has been reckoned obligatory... This much of an answer that you have heard is sufficient, and the principle of taqiyya itself restrains us from disclosing more than this."