Sunan an Nasai
1714
Sahih+2

Mansur reported from Al-Hakam, from Miqsam, that Umm Salamah said:"The Messenger of Allah (ﷺ) used to pray witr with five and seven rak'ahs which he did not separate with any taslim nor talk

SahihAbu Ghuddah
SahihAl-Albani