﴿ قُل لِّلْمُؤْمِنِينَ يَغُضُّوا۟ مِنْ أَبْصَٰرِهِمْ وَيَحْفَظُوا۟ فُرُوجَهُمْ ۚ ذَٰلِكَ أَزْكَىٰ لَهُمْ ۗ إِنَّ ٱللَّهَ خَبِيرٌۢ بِمَا يَصْنَعُونَ ﴾

“Tell the believing men to lower their gaze and to be mindful of their chastity: this will be most con­ducive to their purity – [and,] verily, God is aware of all that they do.”

Allah then commanded them to protect their gaze and chastity, saying: (Tell the believing men) O Muhammad (to lower their gaze) from that which is unlawful (and be modest) and also refrain from unlawful sexual intercourse. (That) protecting their gaze and chastity (is purer for them) is better and more akin to righteousness as far as they are concerned. (Lo! Allah is Aware of what they do) of good and evil.