2 Corinthians 6:14

Be ye not unequally yoked together with unbelievers. — We seem at first to enter, by an abrupt transition, upon a new line of exhortation. The under-current of thought is, however, not difficult to trace. There was a false latitude as well as a true. The baser party at Corinth might think it a matter of indifference whether they married a heathen or a Christian, whether they chose their intimate friends among the worshippers of Aphrodite or of Christ. Against that “enlargement” the Apostle feels bound to protest. The Greek word for “unequally yoked together” is not found elsewhere, and was probably coined by St. Paul to give expression to his thoughts. Its meaning is, however, determined by the use of the cognate noun in Leviticus 19:19 (“Thou shalt not let thy cattle gender with a diverse kind”). Cattle were unequally yoked together when ox and ass were drawing the same plough (Deuteronomy 22:10). Men and women are so when they have no common bond of faith in God. Another explanation refers the image to the yoke of a balance, or pair of scales, and so sees in the precept a warning against partiality in judgment; but this rests on very slender ground, or rather, no ground at all.