وعن جرير رضي الله عنه قال: سألت
رسول الله صلى الله عليه وسلم عن نظر الفجأة فقال: «اصرف بصرك»
I asked the Messenger of Allah (sallallahu alayhi wa sallam) about (the Islamic ruling on) accidental glance (i.e., at a woman one is not Islamically allowed to look at) and he ordered me to turn my eyes away.
Riyad as-Salihin 1625, Book 18, The Book of the Prohibited actions, Hadith 115. 1 min read