Sunan An-Nasa'i

Zuhair narrated from Abu Ishaq, from Sa'eed bin Jubair, :Ibn Abbas used to pray witr with three (units) with (the Surahs): ""Glorify the Name of Your Lord, the Most High"" (Surah Al-A'la), ""Say: O You disbelievers"" (Surah Al-Kafirun), and ""Say: He is Allah, (the) One"" (Surah Al-Ikhlas)