I asked Allah's Messenger (ﷺ) about the sudden glance (that is cast) on the face (of a non-Mahram). He commanded me that I should turn away my eyes.
Sahih Muslim Book 38, Hadith 59
← Previous Hadith If a person were to cast a glance in your (house) without permission, and you had in your hand a staff and you would have thrust that in his eyes, there is no harm for you.

Sahih Muslim Book 38, Hadith 58 Next Hadith → This hadith has been narrated on the authority of Yunus through another chain of transmitters.

Sahih Muslim Book 38, Hadith 60