Sunan An-Nasa'i

It was narrated that Ubayy bin Ka'b said:""The Messenger of Allah (ﷺ) used to recite: ""Glorify the Name of Your Lord, the Most High;"" in witr, in the second rak'ah he would recite: ""Say: O you disbelievers!""; and in the third ""Say: He is Allah, (the) One"". And he only said the taslim at the end, and he would say- meaning after the taslim: Subhanal-Malikil-Quddus (Glory be to the Sovereign, the Most Holy)' three times