عَنْ عَائِشَةَ --رَضِيَ اَللَّهُ عَنْهَا--
قَالَتْ: «سَأَلْتُ رَسُولَ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ اَلِالْتِفَاتِ فِي اَلصَّلَاةِ ? فَقَالَ: «هُوَ اِخْتِلَاسٌ يَخْتَلِسُهُ اَلشَّيْطَانُ مِنْ صَلَاةِ اَلْعَبْدِ» رَوَاهُ اَلْبُخَارِيُّ. 11 صحيح
I asked the Messenger of Allah (sallallahu alayhi wa sallam) about looking around during prayer and he said, “It is something which the devil snatches from a person’s prayer.”.
Bulugh al-Maram 288, Book 2, The Book of Prayer, Hadith 109. 1 min read