Musannaf Ibn Abi Shayba 33:1292

'Affan narrated to us, he said: Sulayman ibn al-Mughirah narrated to us, from Humayd ibn Hilal, he said: Abu Rif'ah al-'Adawi used to say: "Surah al-Baqarah has not escaped my memory since the Messenger of Allah taught it to me, even though I took with it what I took of the Qur'an. And I have never felt pain in my back from standing in prayer at night at all."