Armies: Who of the Israelites Were Subject to Service In
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Numbers 1:2, 3
“Take a census of the whole congregation of Israel by their clans and families, listing every man by name, one by one. / You and Aaron are to number those who are twenty years of age or older by their divisions—everyone who can serve in Israel’s army.
Numbers 26:2
“Take a census of the whole congregation of Israel by the houses of their fathers—all those twenty years of age or older who can serve in the army of Israel.”
2 Chronicles 25:5
Then Amaziah gathered the people of Judah and assigned them according to their families to commanders of thousands and of hundreds. And he numbered those twenty years of age or older throughout Judah and Benjamin and found 300,000 chosen men able to serve in the army, bearing the spear and shield.