Numbers 1:19-21

Amplified Bible, Classic Edition

¹⁹ As the Lord commanded Moses. So he numbered them in the Wilderness of Sinai.

²⁰ The sons of Reuben, Israel’s firstborn, their generations, by their families, by their fathers’ houses, according to the number of names, head by head, every male from twenty years old and upward, all who were able to go to war:

²¹ Those of the tribe of Reuben numbered 46,500.