The Book of Forgetfulness (In Prayer)
13/10. Chapter:
Stern warning against turning around when praying
Sunan an-Nasai
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، قَالَ حَدَّثَنَا زَائِدَةُ، عَنْ أَشْعَثَ بْنِ أَبِي الشَّعْثَاءِ، عَنْ أَبِيهِ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ الاِلْتِفَاتِ فِي الصَّلاَةِ فَقَالَ " اخْتِلاَسٌ يَخْتَلِسُهُ الشَّيْطَانُ مِنَ الصَّلاَةِ " .
It was narrated that 'Aishah, may Allah (SWT) be pleased with her, said: "I asked the Messenger of Allah (ﷺ) about looking here and there during prayer. He said: 'That is something that the Shaitan snatches from one's prayer.'"
Reference : Sunan an-Nasa'i 1196In-book reference : Book 13, Hadith 18English translation : Vol. 2, Book 13, Hadith 1197