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.