Narrated 'Aishah (RA):

I asked Allah's Messenger (ﷺ) about looking around during prayer and he said, "It is something which the devil snatches from a person's prayer." [Reported by al-Bukhari].

عَنْ عَائِشَةَ ‏-‏-رَضِيَ اَللَّهُ عَنْهَا‏-‏- قَالَتْ : { سَأَلْتُ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-عَنْ اَلِالْتِفَاتِ فِي اَلصَّلَاةِ ? فَقَالَ : "هُوَ اِخْتِلَاسٌ يَخْتَلِسُهُ اَلشَّيْطَانُ مِنْ صَلَاةِ اَلْعَبْدِ } رَوَاهُ اَلْبُخَارِيُّ .‏ [1]‏