An-Nur 24:30

قُل لِّلۡمُؤۡمِنِينَ يَغُضُّواْ مِنۡ أَبۡصَٰرِهِمۡ وَيَحۡفَظُواْ فُرُوجَهُمۡۚ ذَٰلِكَ أَزۡكَىٰ لَهُمۡۚ إِنَّ ٱللَّهَ خَبِيرُۢ بِمَا يَصۡنَعُونَ 30

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