Numbers 1:1-2

1 And the Lord spoke unto Moses in the wilderness of Sinai, in the tabernacle of the congregation, on the first day of the second month, in the second year after their going out of the land of Egypt, saying,

2 Take ye the sum of all the congregation of the children of Israel, after their families, by the descent from their fathers, by numbering the names, every male according to their polls;