Sa'eed bin Yasar narrated: "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”””"
SahihSahihHasan SahihBook 3 · Hadith 20