Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) used to pray the witr with "Sabbih", "Qul ya ayyuha al-kafirun" and "Qul huwa Allahu ahad", one surah in each rak'ah.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12381