Sunan An-Nasa'i

Zakariyya bin Abi Za'idah narrated from Abu Ishaq, from Sa'id bin Jubair, that Ibn Abbas said:""The Messenger of Allah (ﷺ) used to pray witr with three rak'ahs. In the first he would recite ""Glorify the Name of Your Lord, the Most High;"" in the second: ""Say: O You disbelievers!"" and in the third: ""Say: He is Allah, (the) One