Jacob 2:24-34
24 Behold, David and Solomon• truly had many wives• and concubines, which thing was abominable• before me, saith the Lord.
25 Wherefore, thus saith the Lord, I have led this people forth out of the land of Jerusalem, by the power of mine arm, that I might raise up unto me a righteous• branch from the fruit of the loins of Joseph.
26 Wherefore, I the Lord God will not suffer that this people shall do like unto them of old.
27 Wherefore, my brethren, hear me, and hearken to the word of the Lord: For there shall not any man among you have save it be one• cwife; and concubines he shall have none;
28 For I, the Lord God, delight in the chastity of women. And whoredoms are an abomination before me; thus saith the Lord of Hosts.
29 Wherefore, this people shall keep my commandments, saith the Lord of Hosts, or cursed• be the land for their sakes.
30 For if I will, saith the Lord of Hosts, raise up seed• unto me, I will command my people; otherwise they shall hearken unto these things.
31 For behold, I, the Lord, have seen the sorrow, and heard the mourning of the daughters of my people in the land of Jerusalem, yea, and in all the lands of my people, because of the wickedness and abominations of their husbands.
32 And I will not suffer, saith the Lord of Hosts, that the cries of the fair daughters of this people, which I have led out of the land of Jerusalem, shall come up unto me against the men of my people, saith the Lord of Hosts.
33 For they shall not lead away captive the daughters of my people because of their tenderness, save I shall visit them with a sore curse, even unto destruction; for they shall not commit whoredoms•, like unto them of old, saith the Lord of Hosts.
34 And now behold, my brethren, ye know that these commandments were given to our father•, Lehi; wherefore, ye have known them before; and ye have come unto great condemnation; for ye have done these things which ye ought not to have done.
======================================
Here is what is being said in my words:
24. David and Solomon had many unauthorized wives and concubines, which the Lord found abominable (because He had not commanded them to do so. If He had authorized it, they would have been blameless.)
25. The Lord intended to lead the Lehites out of Jerusalem so that He could raise a righteous branch of Israel.
26. The Lord would not allow them to practice abominations, such as David and Solomon did (having unauthorized wives and concubines).
27. The Lord commanded the Nephites to have only one wife and no concubines. Thus, the Nephites received the commandment NOT to practice polygamy. Therefore, because the Lord forbade it, it was wrong for them to do it. This is LDS doctrine as well--if the Lord forbids it, it's wrong. If He authorizes and commands it, it is righteous.
28. The Lord loves chastity and hates whoredoms.
29. The Nephites were commanded to observe the commandments or the land would be cursed.
30. The Lord said, If I want to raise up righteous seed unto me, I will command you to do so by practicing polygamy; Otherwise, do not practice it.
31. The Lord has heard the cries of the wives of wicked husbands in Israel due to their abominations.
32. The Lord will not suffer the wives' cries to come up against their husbands.
33. The Lord will curse those who commit whoredoms with a sore curse unto destruction.
34. The Nephite men have come under condemnation by committing whoredoms and abominations.
===========================
Now WBY, the above passage in no way limits what the Lord can command and what He can't. Nor does it forbid authorized polygamy. It merely says that whoredoms are an abomination, and that unauthorized polygamy such as David and Solomon practiced is wrong.