Adapun perkataannya dalam tafsir Al-Qur'an, jumlahnya sangat banyak.

As for his words in commentary on the Qur’an, there are many.

Ibnu Sa°d meriwayatkan bahwa cAli berkata, ‘Demi Allah, tidak ada satu ayat pun yang diturunkan tanpa aku mengetahui tentang apa ayat itu diturunkan, di mana ayat itu diturunkan, dan tentang siapa ayat itu diturunkan. Tuhanku telah menganugerahiku hati yang sangat cerdas dan lidah yang benar serta fasih.’ Ibnu Sa°d dan lainnya meriwayatkan bahwa Abu’t-Tufayl berkata: cAli berkata, ‘Tanyakanlah kepadaku tentang Kitab Allah, karena tidak ada satu ayat pun kecuali aku tahu apakah ayat itu diturunkan pada malam hari atau siang hari, di dataran atau di pegunungan.’ Ibnu Abi Dawud meriwayatkan bahwa Muhammad bin Sirin berkata: Ketika Nabi ﷺ wafat, cAli lambat memberikan baiat kepada Abu Bakar. Abu Bakar menemuinya dan berkata, ‘Apakah engkau tidak menyukai kekuasaanku?’ Ia menjawab, ‘Tidak, tetapi aku telah bersumpah untuk tidak mengenakan selendangku, kecuali untuk salat, hingga aku mengumpulkan Al-Qur’an.’ Mereka mengklaim bahwa ia menuliskannya sesuai urutan turunnya. Muhammad (bin Sirin) lalu berkata, ‘Seandainya kitab itu ditemukan, niscaya di dalamnya terdapat ilmu.’

Ibn Sa°d narrated that cAli said, ‘By Allah, an ayah has not been revealed without me knowing about what it was revealed, where it was revealed, and about whom it was revealed. My Lord has given me a very intelligent heart and a true and articulate tongue.’ Ibn Sacd and others narrated that Abu’t-Tufayl said: cAli said, Ask me about the Book of Allah, because there is no ayah but that I know whether it was revealed at night or in daytime, on the plain or in the mountain.’ Ibn Abi Dawud narrated that Muhammad ibn Sirin said: When the Prophet, may Allah bless him and grant him peace, died, cAli was slow to pledge allegiance to Abu Bakr. Abu Bakr met him and said, ‘Do you dislike my (having the) authority?’ He said, ‘No, but I have sworn not to don my mantle, except for the prayer, until I have collected together the Qur’an.’ They claimed that he wrote it in the order of its revelation. Muhammad (ibn Sirin) thus said, ‘If that book were come across, there would be knowledge in it.’