Numbers 1:2-4

2 Take a census of the whole congregation of Israelites, in their clans, by ancestral houses, according to the number of names, every male individually;
3 from twenty years old and upward, everyone in Israel able to go to war. You and Aaron shall enroll them, company by company.
4 A man from each tribe shall be with you, each man the head of his ancestral house.
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