It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that "the Prophet (peace and blessings be upon him) used to recite 'Sabbih isma rabbika al-a'la' (Surah al-A'la), 'Qul ya ayyuha al-kafirun' (Surah al-Kafirun) and 'Qul huwa Allahu ahad' (Surah al-Ikhlas) in the Witr prayer."
No one narrated this hadith from Abu Ishaq (may Allah have mercy on him), from Nafi' (may Allah have mercy on him), except Ayyub bin Jabir (may Allah have mercy on him), and Abd al-Rahman bin Waqid (may Allah have mercy on him) is alone in narrating it from him.
The narrators in general narrated it from Abu Ishaq (may Allah have mercy on him), from Sa'id bin Jubayr (may Allah have mercy on him), from Sayyiduna Ibn Abbas (may Allah be pleased with them both).
And Isra'il (may Allah have mercy on him) narrated it from Abu Ishaq (may Allah have mercy on him), from Muslim al-Batin (may Allah have mercy on him), from Sa'id bin Jubayr (may Allah have mercy on him), from Sayyiduna Ibn Abbas (may Allah be pleased with them both).
Hadith Referenceالمعجم الأوسط / باب الميم / 7312
Hadith Takhrij«أخرجه البزار فى «مسنده» برقم: 5381، والطبراني فى «الكبير» برقم: 14115»