An-Nur 24:30

Qul lilmu/mineena yaghuddoo min absarihumwayahfathoo furoojahum thalika azkalahum inna Allaha khabeerun bima yasnaAAoon

Tell the believing men to reduce [some] of their vision and guard their private parts. That is purer for them. Indeed, Allāh is [fully] Aware of what they do.

Tell the believing men that they must lower their gazes and guard their private parts; it is more decent for them. Surely Allah is All-Aware of what they do.