"Go down unto our brethren"

1. Alma 27: 7-8
     7 And Ammon said: I will go and inquire of the Lord, and if he say unto us, go down unto our brethren, will ye go?
     8 And the king said unto him: Yea, if the Lord saith unto us go, we will go down unto our brethren, and we will be their slaves until we repair unto them the many murders and sins which we have committed against them.