Musannaf Ibn Abi Shayba 27:173

Ya'la ibn 'Ubayd narrated to us, from Muhammad ibn Ishaq, from al-Zuhri, from 'Ubayd Allah, from Ibn 'Abbas, who said: The Messenger of Allah (may Allah bless him and grant him peace) used to present the Book to Gabriel every Ramadan. When the Messenger of Allah (may Allah bless him and grant him peace) would wake up from the night in which he presented what he presented, he would wake up being more generous than the sent wind; he would not be asked for anything except that he gave it.