Your focus on IF seems to imply that the Lord commanding them to raise up seed is a hypothetical situation that they are not currently under but the Lord could command if he so desired.rewcox wrote: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.
In the context of Jacob speaking to the people, raise up seed is more than one wife, otherwise, they will hearken unto one wife and one husband.
"IF" doesn't have just one meaning, and if this interpretation is correct, that God is speaking hypothetically about something he has not yet commanded. The glaring problem with this is that he has already commanded them to "raise up seed" unto him but under monogamy. Again, the Nephites have already been commanded to raise up seed, and this language, particularly the "unto him" is indicative of the covenant language used in verse 25 where the Lord is again talking about how he brought them out of Jerusalem for the purpose of raising up seed (the fruit of the loins) of Joseph.
It's already been commanded. So to suggest that the Lord is indicating that it hasn't been is contradictory. If indeed does tend toward some hypothetical state such as "If your toys are not picked up, you are going to be grounded" or "If I'm going to finish this project I'll need to follow the instructions better" but the hypothetical state is not polygamy, it is whether or not the Lord will be able to raise up seed unto him, the condition being whether or not his people will obey his commands. If he is going to establish a righteous people (raise up) from the fruit loins of Joseph (seed), the only way is for that people to be obedient to the commandments of God.