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عن العبَّاس رضي الله عنه، قال: يا رسولَ اللهِ، علِّمني شيئًا أَسأُلُه اللهَ. قال: سلِ اللهَ العافيةَ، فمكثتُ أَيَّامًا، ثمَّ جئتُ، فقلتُ: يا رسولَ اللهِ، علِّمي شيئًا أَسأَلُه اللهَ، فقال لي: يا عبَّاسُ، يا عمَّ رسولِ اللهِ، سلِ اللهَ العافيةَ في الدُّنيا والآخرةِ.

صحيح التِّرمذيُّ رقم ٣٥١٤.

Abū Saʿīd al-Khudrī said, "A man heard someone recite repeatedly (during his night prayers), ‘Qul huwal-llāhu aḥad.’

The next morning he went to the Prophet ʿalayhi al-salam and complained as if he found the recitation too brief. However, the Prophet ʿalayhi al-salam said, ‘By the One in Whose hand lies my soul. That chapter equals one third of the Qurʾan.'”

— Bukhārī no. 6643

Abū Bakr b. Kāmil said, "I asked Abū Jaʿfar al-Ṭabarī about his dispute with al-Muzanī, but he did not speak of it. He was not the kind to boast about having gained the better of an adversary in a debate."

— Ṭabarī, Jāmiʿ al-bayān fī taʾwīl al-qurʾān, i. 10

Isḥāq b. Rāhwayh said, "I have never heard anything that I did not learn by heart, and I have never learned anything by heart and then forgotten it."

— Ḏh̲ahabī, Tad̲h̲īb al-tahd̲h̲īb, i. 315

Lord, I seek refuge with you from knowledge that does not benefit, from a heart that is not afraid, from a self that is not satisfied, and from a prayer that is not answered.

— Muslim no. 6906