Musannaf Ibn Abi Shayba 22:356

Husayn ibn Ali narrated to us, from Ja’far ibn Muhammad, he said: Zayd ibn Ali narrated to me, he said: I passed by Abu Ja’far while he was in his house, and he was saying: "O Allah, forgive me through the Quran. O Allah, have mercy on me through the Quran. O Allah, guide me through the Quran. O Allah, provide for me through the Quran."