Sunan An-Nasa'i

Sa'eed bin 'Abdur-Rahman bin Abza narrated from his father, that:Ubayy bin Ka'b said: ""The Messenger of Allah (ﷺ) used to recite in Witr: ""Glorify the Name of your Lord, the Most High;"" and ""Say: O you disbelievers!;' and 'Say: He is Allah, (the) One.' And when he said the salam, he would say: Subhanal-Malikil-Quddus (Glory be to the Sovereign, the Most Holy) three times