"The Prophet would pray two Rak'ah after Al-Witr."
Jami` at-Tirmidhi Book 3, Hadith 19
← Previous Hadith his father said: I heard Allah's Messenger saying: "There are no two Witr in one night."

Jami` at-Tirmidhi Book 3, Hadith 18 Next Hadith → "I was with Ibn Umar on a journey and I fell behind him. He said: 'Where were you?' I said: 'I prayed Al-Witr.' He said: 'Is there not a good exampled for you in Allah's Messenger? I saw Allah's Messenger performing Al-Witr on his mount.'"

Jami` at-Tirmidhi Book 3, Hadith 20