Numbers 26:2-4

Thomson^{(i) 2} Take the sum of the whole congregation of Israel, from twenty years old and upwards, according to the houses of their families, every one who goeth out to war in Israel. ³ Upon which, orders were issued by Moses, and Eleazar the priest, at Araboth-Moab, on the Jordan over against Jericho, saying, ⁴ From twenty years old and upwards, as the Lord commanded Moses. Now these were the sons of Israel who came out of Egypt.