Sunan an-Nasa'i 1715
سنن النسائي#1715SahihMansur reported from Al-Hakam, from Miqsam, from Ibn 'Abbas that Umm Salamah said:"The Messenger of Allah (ﷺ) used to pray witr with seven or five (rak'ahs), not separating between them with the taslim
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 20:118