Musannaf Ibn Abi Shaybah 8713 — The excellence of the night prayer

Abu Salamah said: I said to Sayyidah Aishah (may Allah be pleased with her): Tell me about the night prayer (tahajjud) of the Messenger of Allah (peace and blessings be upon him). She said: He (peace and blessings be upon him) used to pray thirteen rak'ahs at night, in Ramadan and outside Ramadan, and these included the two sunnah rak'ahs of Fajr.