Question: Where does it specifically say in the Bible that individuals should not have sex before ...

Question: Where does it specifically say in the Bible that individuals should not have sex before marriage, especially given the biblical examples of men having multiple wives, concubines, etc., going clear back to Abraham and even through King David, a man after God’s own heart?

Response: The Bible is quite clear on the matter. Jesus said in Mark:7:20-22 [20] And he said, That which cometh out of the man, that defileth the man. [21] For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, [22] Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness:
See All..., “That which cometh out of the man, that defileth the man. For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness [our emphasis].” Jesus condemns both “fornication” (sex before marriage) and adultery (sex with a person other than your spouse) after marriage.

Multitudes of Scriptures declare that sex before marriage is a sin (Acts:15:20But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood.
See All...; 1 Cor:5:1It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.
See All...; 6:13,18; 10:8; 2 Cor:12:21And lest, when I come again, my God will humble me among you, and that I shall bewail many which have sinned already, and have not repented of the uncleanness and fornication and lasciviousness which they have committed.
See All...; Gal:5:19Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
See All...; Eph:5:3But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;
See All...; Col:3:5Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:
See All...; 1 Thes:4:3For this is the will of God, even your sanctification, that ye should abstain from fornication:
See All...; Jude:1:7Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire.
See All..., etc.). Scripture consistently admonishes us to abstain from sex before marriage. Sex between a husband and his wife is the only form of sexual relations of which God approves (Heb:13:4Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.
See All...). “Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband” (1 Cor:7:2Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband.
See All...).