Numbers 1:20

Christian Standard Bible

The descendants of Reuben,  the firstborn of Israel: according to their family records by their clans and their ancestral families, counting one by one the names of every male twenty years old or more, everyone who could serve in the army,

Cross References

1 Chronicles 5:1

These were the sons of Reuben the firstborn of Israel. He was the firstborn,  but his birthright was given to the sons of Joseph  son of Israel, because Reuben defiled his father’s bed.  He is not listed in the genealogy according to birthright.

Genesis 46:9

Reuben’s sons:  Hanoch, Pallu, Hezron, and Carmi.

Genesis 29:32

Leah conceived, gave birth to a son, and named him Reuben,  for she said, “The Lord has seen my affliction;  surely my husband will love me now.”

Numbers 1:21

those registered for the tribe of Reuben numbered 46,500.

Genesis 35:23

Leah’s sons were Reuben (Jacob’s firstborn), Simeon, Levi, Judah, Issachar, and Zebulun.