Numbers 1:19-21

New American Standard Bible

¹⁹ just as ^(A)the Lord had commanded Moses. So he counted them in the wilderness of Sinai.

^20 (B)Now the sons of Reuben, Israel’s firstborn, their descendants 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 to war, ²¹ their numbered men of the tribe of Reuben were 46,500.