Numbers 26:1-3

Then it came about after the plague, that the Lord spoke to Moses and to Eleazar the son of Aaron the priest, saying,

“Take a census of all the congregation of the sons of Israel from twenty years old and upward, by their fathers’ households, whoever is able to go to war in Israel.”

So Moses and Eleazar the priest spoke with them in the plains of Moab by the Jordan at Jericho, saying,