Numbers 1:2-3

1:2 “Take a census of the entire Israelite community by their clans and families, counting the name of every individual male. 1:3 You and Aaron are to number all in Israel who can serve in the army, those who are twenty years old or older, by their divisions.

Exodus 30:12

30:12 “When you take a census of the Israelites according to their number, then each man is to pay a ransom for his life to the Lord when you number them, so that there will be no plague among them when you number them.

Exodus 38:25-26

38:25 The silver of those who were numbered of the community was one hundred talents and 1,775 shekels, according to the sanctuary shekel, 38:26 one beka per person, that is, a half shekel, according to the sanctuary shekel, for everyone who crossed over to those numbered, from twenty years old or older, 603,550 in all.