Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Noble Prophet (peace and blessings be upon him) used to pray three rak‘ahs of Witr; in the first rak‘ah he would recite «سَبِّحِاسْمَرَبِّكَالْأَعْلَى», in the second rak‘ah «قُلْيَاأَيُّهَاالْكَافِرُونَ», and in the third rak‘ah «قُلْهُوَاللَّهُأَحَدٌ».
Hadith Referenceسنن دارمي / من كتاب الصللاة / 1628