Ether 9:8–9

And now the brother of him that suffered death, (and his name was Nimrah) was angry with his father because of that which his father had done unto his brother. And it came to pass that Nimrah gathered together a small number of men, and fled out of the land, and came over and dwelt with Omer.

From section: Omer’s Escape and Akish’s Mafia

From page: Jaredite Era