“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.’”  

أَمَا لَكَ فِي رَسُولِ اللَّهِ ﷺ أُسْوَةٌ حَسَنَةٌ قُلْتُ بَلَى قَالَ فَإِنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُوتِرُ عَلَى بَعِيرِهِ  

It was narrated from Ibn ‘Abbas that the Prophet ﷺ used to pray Witr while riding his mount.  

أَنَّ النَّبِيَّ ﷺ كَانَ يُوتِرُ عَلَى رَاحِلَتِهِ