"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."
Sunan an-Nasa'i Book 20, Hadith 117
← Previous Hadith "Whoever wants to pray witr with seven (rak'ahs) let him do so, and whoever wants to pray witr with five (rak'ahs) let him do so, and whoever wants to pray witr with three rak'ahs, let him do so; and whoever wants to pray witr with one rak'ah, let him do so, and wants to do so gesturing, let him do so.'"

Sunan an-Nasa'i Book 20, Hadith 116 Next Hadith → "The Messenger of Allah (ﷺ) used to pray witr with seven or five (rak'ahs), not separating between them with the taslim."

Sunan an-Nasa'i Book 20, Hadith 118