Hadith 270
Sayyiduna Abdullah bin Umar (may Allah be pleased with them) narrates that the Messenger of Allah (peace and blessings be upon him) used to perform all voluntary prayers, including Witr, on his mount, facing whichever direction it was headed; however, he did not perform obligatory prayers on his mount.
Hadith 271
Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) used to recite Surah Al-A'la, Surah Al-Kafirun, and Surah Al-Ikhlas in the Witr prayer, and after concluding with salam, he used to recite «سُبْحَانَ الْمَلِكِ الْقُدُّوسِ» three times.