It was narrated from Ibn Abbas that, “the Prophet (May Allāh praise him and Peace be upon him) used to pray three raka‘āt (units of prayer) for witr. In the first rak‘ah, he would recite Sūrah Al-A‘lā (Sūrah no. 87). In the second, he would recite Sūrah Al-Kāfirūn (Sūrah no. 109). In the third rak‘ah, he would recite Sūrah Al-Ikhlāṣ (Sūrah no. 112). [This ḥadīth was graded as ṣaḥīḥ (authentic) by Al-Shaykh Al-Albānī in Ṣaḥīḥ Sunan Al-Nasāī]