Musnad Ahmad 3479
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
Sa'eed bin Jubair said: I heard Ibn ‘Abbas (رضي الله عنه) say: I came to my maternal aunt Maimoonah and I found that that was her night with the Messenger of Allah (ﷺ)... And he narrated a hadeeth like that of Yazeed, except that he said: until when the first dawn came, the Messenger of Allah (ﷺ) paused for awhile, then when it grew light he got up and prayed Witr with nine rak'ahs, saying the salam after each two rak'ahs. Then when he had finished his Witr, he paused for awhile, and when he realised it was time for Fajr, the Messenger of Allah (ﷺ) got up and prayed the two (Sunnah) rak'ahs of Fajr, then he lay down and slept until I could hear him breathing deeply. Then Bilal came and woke him up for the prayer, and the Messenger of Allah (ﷺ) got up and prayed Fajr.