4 “Take a census, from twenty years old and upward, as Yahweh commanded Moses and the children of Israel.” These are those that came out of the land of Egypt.
Numbers 26:4 Cross References - WEB
Numbers 1:1
1 Yahweh spoke to Moses in the wilderness of Sinai, in the Tent 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,
1 Chronicles 21:1
1 Satan stood up against Israel, and moved David to take a census of Israel.