The above-mentioned verses:
24 Behold, David and aSolomon truly had many bwives and concubines, which thing was cabominable 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 arighteous 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 aman among you have save it bebone cwife; and concubines he shall have none;
28 For I, the Lord God, delight in the achastity of women. Andbwhoredoms 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 acursed be the land for their sakes.
30 For if I will, saith the Lord of Hosts, raise up aseed unto me, I will command my people; otherwise they shall hearken unto these things.
In other words, if God needs more babies raised in the true faith, then he will explicitly allow polygamy. Otherwise it is implicitly, and now even explicitly, off limits.