Numbers 1:2

2 a  Take a census of all the congregation of the people of Israel, by clans b  by fathershouses, according to the number of names, every male, head by head.

Numbers 1:18

18and on the first day of the second month, they assembled the whole congregation together, who registered themselves by clans, by fathershouses, according to the number of names from twenty years old and upward, head by head,
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