Surah An-Nur 24:30

قُل لِّلْمُؤْمِنِينَ يَغُضُّوا۟ مِنْ أَبْصَـٰرِهِمْ وَيَحْفَظُوا۟ فُرُوجَهُمْ ۚ ذَٰلِكَ أَزْكَىٰ لَهُمْ ۗ إِنَّ ٱللَّهَ خَبِيرٌۢ بِمَا يَصْنَعُونَ

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.

Translation: Saheeh International

Tafsir

Tell believing men to lower their gaze from what is unlawful for them to look at min of min absārihim ‘their gaze’ is extra and to guard their private parts from doing with them what is unlawful for them to do. That is purer in other words better for them. …

Excerpt from Tafsir al-Jalalayn, commentary on 24:30, via Quran.com. The reader has the full commentary and 9 more tafsirs.