Musannaf Ibn Abi Shayba 3:1184

Ibn Fudayl narrated to us, from ‘Ata’ ibn al-Sa’ib, from Abu ‘Abd al-Rahman, that he said: I have not seen a man who is a better reciter than ‘Ali. He led us in the dawn prayer and recited [Surah] al-Anbiya’. He said: When he reached the seventieth verse, he omitted a verse from it, then recited what was after it. Then he remembered, so he returned and recited it. Then he returned to the place where he had been reciting, and he did not falter.