Sunan an-Nasa'i 1708
سنن النسائي#1708SahihIt was narrated that Umm Salamah said:"The Messenger of Allah (ﷺ) used to pray witr with thirteen rak'ahs, and when he grew older and weaker he prayed witr with nine
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Isnaad
Al-AlbaniSahih Isnaad
Zubair Ali ZaiSahih
In-book reference: 20:111