24:30
قُل لِّلْمُؤْمِنِينَ يَغُضُّوا۟ مِنْ أَبْصَـٰرِهِمْ وَيَحْفَظُوا۟ فُرُوجَهُمْ ۚ ذَٰلِكَ أَزْكَىٰ لَهُمْ ۗ إِنَّ ٱللَّهَ خَبِيرٌۢ بِمَا يَصْنَعُونَ
qul lil'mu'minīna yaghuḍḍū min abṣārihim wayaḥfaẓū furūjahum dhālika azkā lahum inna l-laha khabīrun bimā yaṣnaʿūna
[Prophet], tell believing men to lower their glances and guard their private parts: that is purer for them. God is well aware of everything they do.
Tell the believing men to lower their gaze (from looking at forbidden things), and protect their private parts (from illegal sexual acts). That is purer for them. Verily, Allâh is All-Aware of what they do.