It is narrated from Sayyiduna Imran bin Husayn (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) used to recite 'Sabbih isma rabbika al-a'la', 'Qul ya ayyuha al-kafirun' and 'Qul huwa Allahu ahad' in the witr prayer.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15629