Numbers 1:20

1:20 And they were as follows:

The descendants of Reuben, the firstborn son of Israel: According to the records of their clans and families, all the males twenty years old or older who could serve in the army were listed by name individually.

Numbers 1:22

1:22 From the descendants of Simeon: According to the records of their clans and families, all the males numbered of them twenty years old or older who could serve in the army were listed by name individually.

Numbers 3:45

3:45 “Take the Levites instead of all the firstborn males among the Israelites, and the livestock of the Levites instead of their livestock. And the Levites will be mine. I am the Lord.

Numbers 8:17

8:17 For all the firstborn males among the Israelites are mine, both humans and animals; when I destroyed all the firstborn in the land of Egypt I set them apart for myself.

Numbers 18:15

18:15 The firstborn of every womb which they present to the Lord, whether human or animal, will be yours. Nevertheless, the firstborn sons you must redeem, and the firstborn males of unclean animals you must redeem.

Numbers 32:1

The Petition of the Reubenites and Gadites

32:1 Now the Reubenites and the Gadites possessed a very large number of cattle. When they saw that the lands of Jazer and Gilead were ideal for cattle,

Numbers 34:14

34:14 because the tribe of the Reubenites by their families, the tribe of the Gadites by their families, and half of the tribe of Manasseh have received their inheritance.