2 Bible Verses About Sex Before Marrage (ESV)

20 But if the thing is true, that evidence of virginity was not found in the young woman, 21 then they shall bring out the young woman to the door of her father’s house, and the men of her city shall stone her to death with stones, because she has done an outrageous thing in Israel by whoring in her father’s house. So you shall purge the evil from your midst.

4 Let marriage be held in honor among all, and let the marriage bed be undefiled, for God will judge the sexually immoral and adulterous.