الاسراۤء — Al-Isra' Ayat 32

وَلَا تَقْرَبُوا الزِّنٰىٓ اِنَّهٗ كَانَ فَاحِشَةً ۗوَسَاۤءَ سَبِيْلًا

Wa lā taqrabuz-zinā innahū kāna fāḥisyah(tan), wa sā'a sabīlā(n).

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