It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) performed the witr prayer on his mount (while seated on it).
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Zuhri except Yunus, and no one narrated it from Yunus except Abdullah bin al-Harith; Abd al-Rahman bin Yunus is alone in narrating it."