Numbers 1:20

The sons of Reuben, Israel’s (Jacob’s) firstborn, their generations, by their families (clans), by their fathers’ households, 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:

Numbers 26:5-7

Reuben, the firstborn of Israel (Jacob), the sons of Reuben: of Hanoch, the family of the Hanochites; of Pallu, the family of the Palluites;

Numbers 2:10-11

“On the south side shall be the standard of the camp of Reuben, by their armies; and Elizur the son of Shedeur shall lead the sons of Reuben,

Genesis 29:32

Leah conceived and gave birth to a son and named him Reuben (See, a son!), for she said, “Because the Lord has seen my humiliation and suffering; now my husband will love me [since I have given him a son].”

Genesis 46:9

The sons of Reuben: Hanoch, Pallu, Hezron, and Carmi.

Genesis 49:3-4


“Reuben, you are my firstborn;
My might, the beginning of my strength and vigor,
Preeminent in dignity and preeminent in power [that should have been your birthright].

1 Chronicles 5:1

Now [we come to] the sons of Reuben the firstborn of Israel—for Reuben was the eldest, but because he defiled his father’s bed [with Bilhah his father’s concubine], his birthright was given to [Manasseh and Ephraim] the sons of Joseph [the favorite] son of Israel, so that he is not enrolled in the genealogy according to the birthright.

Treasury of Scripture Knowledge

Summary

And the children of Reuben, Israel's eldest son, by their generations, after their families, by the house of their fathers, according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war;

Bible References

General references

Numbers 2:10
“On the south side shall be the standard of the camp of Reuben, by their armies; and Elizur the son of Shedeur shall lead the sons of Reuben,
Numbers 26:5
Reuben, the firstborn of Israel (Jacob), the sons of Reuben: of Hanoch, the family of the Hanochites; of Pallu, the family of the Palluites;
Genesis 29:32
Leah conceived and gave birth to a son and named him Reuben (See, a son!), for she said, “Because the Lord has seen my humiliation and suffering; now my husband will love me [since I have given him a son].”
Genesis 46:9
The sons of Reuben: Hanoch, Pallu, Hezron, and Carmi.
Genesis 49:3

“Reuben, you are my firstborn;
My might, the beginning of my strength and vigor,
Preeminent in dignity and preeminent in power [that should have been your birthright].
1 Chronicles 5:1
Now [we come to] the sons of Reuben the firstborn of Israel—for Reuben was the eldest, but because he defiled his father’s bed [with Bilhah his father’s concubine], his birthright was given to [Manasseh and Ephraim] the sons of Joseph [the favorite] son of Israel, so that he is not enrolled in the genealogy according to the birthright.