Numbers 1:20
From the sons of Reuben, the firstborn of Israel, according to the records of their clans and families, counting one by one the names of every male twenty years of age or older, everyone who could serve in the army,

Numbers 1:22
From the sons of Simeon, according to the records of their clans and families, counting one by one the names of every male twenty years of age or older who could serve in the army,

Numbers 26:7
These were the clans of Reuben, and their registration numbered 43,730.