17-19Moses and Aaron took these men who had been named to help and gathered the whole congregation together on the first day of the second month. The people registered themselves in their tribes according to their ancestral families, putting down the names of those who were twenty years old and older, just as God commanded Moses. He numbered them in the Wilderness of Sinai.
20-21The line of Reuben, Israel's firstborn: The men were counted off head by head, every male twenty years and older who was able to fight in the army, registered by tribes according to their ancestral families. The tribe of Reuben numbered 46,500.