Numbers 1:1-4

1Now the Lord spoke to Moses in the Wilderness of Sinai, in the tabernacle of meeting, on the first day of the second month, in the second year after they had come out of the land of Egypt, saying:

2“Take a census of all the congregation of the children of Israel, by their families, by their fathers’ houses, according to the number of names, every male individually,

3from twenty years old and above—all who are able to go to war in Israel. You and Aaron shall number them by their armies.

4And with you there shall be a man from every tribe, each one the head of his father’s house.