Numbers 1:3
“From twenty years old and upward, all that are able to go forth to war in Israel: thou and Aaron shall number them by their armies.”
And the Lord spake 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 they were come out of the land of Egypt, saying,
Take ye the sum of all the 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;
From twenty years old and upward, all that are able to go forth to war in Israel: thou and Aaron shall number them by their armies.
And with you there shall be a man of every tribe; every one head of the house of his fathers.
And these are the names of the men that shall stand with you: of the tribe of Reuben; Elizur the son of Shedeur.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Related Verses
“Of the children of Asher, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;”
“So were all those that were numbered of the children of Israel, by the house of their fathers, from twenty years old and upward, all that were able to go forth to war in Israel;”
“Of the children of Zebulun, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;”
“Of the children of Issachar, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;”
“Of the children of Gad, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;”