Sunan an-Nasa'i 1201
سنن النسائي#1201SahihIt was narrated that Ibn 'Abbas said:"The Messenger of Allah (ﷺ) used to turn to his right and left when praying, but he did not twist his neck to look behind him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 13:23