Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah Narrated ‘Aisha (Radi-Allahu ‘anha):
I asked the Prophet (Sallallahu ‘Alaihi Wa Sallam) about one’s looking here and there during the prayer. He replied, “It is what Satan steals from the prayer of any one of you.”
Bukhari Vol. 4 : No. 511