Numbers 1:2. “Take the number of the whole congregation of the children of Israel after their families, by the house of their fathers, with the number of their names, every male by their polls, 3. from twenty years old and upward, all that are able to go forth to war in Israel: you and Aaron will number them by their armies. 4. And there will be a man from every tribe with you, each one head of the house of his fathers.