سنن ابن ماجه

It was narrated that Sa’eed bin Yasar said: “I was with Ibn ‘Umar and I lagged behind and prayed Witr. He said: ‘What kept you?’ I said: ‘I was praying Witr.’ He said: ‘Do you not have the best of examples in the Messenger of Allah (ﷺ)?’ I said: ‘Of course.’ He said: ‘The Messenger of Allah (ﷺ) used to pray Witr while riding his camel.’”