It is narrated from Sa'id bin Yasar (may Allah have mercy on him) that he said: I was (travelling) with Sayyiduna Ibn Umar (may Allah be pleased with them both) on the road to Makkah. When I feared that dawn would come, I dismounted and began to pray the witr prayer. Sayyiduna Ibn Umar (may Allah be pleased with them both) said to me: Do you not have in the life of the Messenger of Allah (peace and blessings be upon him) "an excellent example" [Surah al-Ahzab: 21]? I said: Why not! Certainly I have. He said: the Messenger of Allah (peace and blessings be upon him) used to pray witr on a camel.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2212
It is narrated from Nafi' that Sayyiduna Ibn Umar (may Allah be pleased with them both) used to offer (voluntary) prayer on his mount, in whichever direction it carried him, and he would also offer witr on it, and he would say: "the Messenger of Allah (peace and blessings be upon him) also used to do the same."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2213
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) used to offer the witr prayer on his mount.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2214
It is narrated from Jarir bin Hazim (may Allah have mercy on him) that he said: I asked Nafi' (may Allah have mercy on him): Did Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) use to pray witr on the mount? He said: Does witr have any superiority over all the other voluntary prayers? By Allah! He used to offer witr on the mount.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2215
Hadith Gradingمحدثین:صحيح
Hadith Takhrij«صحيح۔ اخرجه ابن عدي في الكامل 2/192»
Thuwayr bin Abi Fakhitah narrates from his father that Sayyiduna Ali (may Allah be pleased with him) used to offer witr on his mount. (In the chain through al-Thawri there is also the addition that he would perform (the bowing and prostration) by gestures.)
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2217