Reference: Fornication
American
This word is used in Scripture not only for the sin of impurity between unmarried persons, but for idolatry, and for all kinds of infidelity to God. In Eze 16, the Jewish church is symbolized as a female infant, growing up to womanhood, and then wedded to Jehovah by covenant. When she breaks her covenant by going after idols, she is justly reproached as an adulteress and a harlot, Jer 2:20; 3:8-9; Ho 3:1. Adultery and fornication are frequently confounded. Both the Old and New Testaments condemn all impurity and fornication, corporeal and spiritual-idolatry , apostasy, heresy, and infidelity. See ADULTERY.
Easton
in every form of it was sternly condemned by the Mosaic law (Le 21:9; 19:29; De 22:20-21,23-29; 23:18; Ex 22:16). (See Adultery.)
But this word is more frequently used in a symbolical than in its ordinary sense. It frequently means a forsaking of God or a following after idols (Isa 1:2; Jer 2:20; Eze 16; Ho 1:2; 2:1-5; Jer 3:8-9).
Fausets
Used for adultery (Mt 5:32). Also spiritual unfaithfulness to the Lord, Israel's and the church's husband (Ezekiel 16; Jeremiah 2; Hosea 1; Re 17:4).
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Hastings
Morish
This was very common among the Gentiles, which accounts for its being mentioned in the message sent from the conference at Jerusalem to the Gentiles, Ac 15:20,29; and its being so often prohibited in the epistles. The word is sometimes used where 'adultery' is the sense. Mt 5:32; 19:9. It often has in the O.T. a symbolical reference to the turning from God to idols. 2Ch 21:11,13; Isa 23:17; Eze 16:15,26,29; and in the N.T. to unfaithful intercourse with Babylon, the mother of harlots. 4/8/type/worrell'>Re 14:8; 17:2,4; 18:3,9.
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Watsons
FORNICATION, whoredom, or the act of incontinency between single persons; for if either of the parties be married, the sin is adultery.