Richard Ballantyne cites Old Testament scripture to justify polygamy.
Richard Ballantyne, Dialogue between A. and B. on Polygamy (n.p., 1853–1854), 2
B. I believe these Latter Day Saints do not teach us any such doctrine. Their Mission is not to inculcate such principles to us, but, on the contrary, they consider that a man should be able to govern himself, and live in chastity, before that he is really entitled to one wife. They do not however forbid marriage to any one agreeably to the laws of the country under trhich they live.
But Mr. A. you remarked that a plurality of wives was certainly against the Law of God, and that you could not for a moment entertain the idea that God would bless or fellowship such characters. This I think is going a little too far. Was not Abraham the friend of God ? Did not Jacob attain to so close a friendship with God that he wrestled with him, and would not let him go till he obtained a blessing ? Was not David, whose Psalms we so devoutly cherish, and whose pious effusions are so congenial to the feelings of every true disciple of Jesus, a man after "God's own heart"? And yet these eminent prophets, and many other valiant men of God, not even Moses excepted, were polygamists, in other words they all had more than one wife ; and the Law of God, in the Old Testament, in some cases, required a man to take more than one. Deut. 25 — 5 to 10; Ruth 3d and 4th chaps., Deut. 21—15, 16, 17.
A. The domestic order of these holy men and the Law of God relating thereto I never thought of before. Their conduct was certainly approbated of God, and their posterity were greatly blessed. Even our Lord Jesus Christ came into the world through their lineage, But these things were practised under the Law of Moses, only.
B. The Law of Moses we are told in Gal. 3—17 was not given till 430 years after Abraham's day ; and we are told by Paul in Heb. 4 — 2 "that to them (the house of Israel before the giving of the Law) was the Gospel preached, as well as unto us, and in Gal. 3—19 we are told that the Law was afterwards added to the Gospel, because of transgression. Abraham lived under the Gospel and not under the Law of Moses, and through Jesus Christ the blessings of Abraham came on the Gentiles through faith, whereby they (the Gentiles) were numbered in the same Gospel covenant with Abraham, and as Paul again says "so then they which be of faith are blessed with faithful Abraham" Gal, 3—9. Furthermore it is evident that Moses was a Christian for he "esteemed the reproach of Christ greater riches than the treasures of Egypt." Heb. 11 — 26. Polygamy, then, was practised under the Gospel as well as under the Law.