Sunan Ibn Majah 1172
سنن ابن ماجه#1172SahihIt was narrated from Ibn ‘Abbas that the Messenger of Allah (ﷺ) used to perform Witr and recite:“Glorify the Name of your Lord the Most High,” [Al-A’la (87)] “Say: O you disbelievers!” [Al-Kafirun (109)] and ‘Say: Allah is One.”. [Al-Ikhlas (112)] Another chain with similar wording
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 5:370