1 Chronicles 5:3

The sons of Reuben, the oldest son of Israel: Hanoch and Pallu, Hezron and Carmi.

Genesis 46:9

And the sons of Reuben: Hanoch and Pallu and Hezron and Carmi;

Exodus 6:14

These are the heads of their fathers' families: the sons of Reuben the oldest son of Israel: Hanoch and Pallu, Hezron and Carmi: these are the families of Reuben.

Numbers 26:5-9

Reuben, the first son of Israel: the sons of Reuben by their families: of Hanoch, the family of the Hanochites: of Pallu, the family of the Palluites:

Treasury of Scripture Knowledge

Summary

The sons, I say, of Reuben the firstborn of Israel were, Hanoch, and Pallu, Hezron, and Carmi.

Bible References

Sons

Genesis 46:9
And the sons of Reuben: Hanoch and Pallu and Hezron and Carmi;
Exodus 6:14
These are the heads of their fathers' families: the sons of Reuben the oldest son of Israel: Hanoch and Pallu, Hezron and Carmi: these are the families of Reuben.
Numbers 26:5
Reuben, the first son of Israel: the sons of Reuben by their families: of Hanoch, the family of the Hanochites: of Pallu, the family of the Palluites:

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain