Sunan Ibn Majah — Establishing the Prayer and the Sunnah Regarding Them — Hadith No: 1006
Translation
It was narrated that Bara’ said:“When we performed prayer behind the Messenger of Allah (ﷺ) (One of the narrators) Mis’ar said: ‘One of the things we liked, or one of the things I liked’ ‘was to stand to his right.’”