Surah Al-Isra, Verse 32

وَلَا تَقۡرَبُواْ ٱلزِّنَىٰٓۖ إِنَّهُۥ كَانَ فَٰحِشَةٗ وَسَآءَ سَبِيلٗا٣٢

walā taqrabū l-zinā innahu kāna fāḥishatan wasāa sabīlan

And do not approach unlawful sexual intercourse. Indeed, it is ever an immorality and is evil as a way.