Numbers 1:18-20

New American Standard Bible 1995

¹⁸ and they assembled all the congregation together on the ^(A)first of the second month. Then they registered by ^(B)ancestry in their families, by their fathers’ households, according to the number of names, from twenty years old and upward, head by head, ¹⁹ just as ^(C)the Lord had commanded Moses. So he numbered them in the wilderness of Sinai.

^20 (D)Now the sons of Reuben, Israel’s firstborn, their genealogical registration by their families, by their fathers’ households, according to the number of names, head by head, every male from twenty years old and upward, whoever was able to go out to war,