Numbers 26:19

The sons of Judah, Er and Onan: and Er and Onan had come to their death in the land of Canaan.

Genesis 46:12

And the sons of Judah: Er and Onan and Shelah and Perez and Zerah: but Er and Onan had come to their death in the land of Canaan; and the sons of Perez were Hezron and Hamul.

Genesis 38:1-10

Now at that time, Judah went away from his brothers and became the friend of a man of Adullam named Hirah.

1 Chronicles 2:3-8

The sons of Judah: Er and Onan and Shelah; these three were his sons by Bathshua, the Canaanite woman. And Er, Judah's oldest son, did evil in the eyes of the Lord; and he put him to death.

Treasury of Scripture Knowledge

Summary

The sons of Judah were Er and Onan: and Er and Onan died in the land of Canaan.

General references

Bible References

Er and onan

Genesis 38:1
Now at that time, Judah went away from his brothers and became the friend of a man of Adullam named Hirah.
Genesis 46:12
And the sons of Judah: Er and Onan and Shelah and Perez and Zerah: but Er and Onan had come to their death in the land of Canaan; and the sons of Perez were Hezron and Hamul.
1 Chronicles 2:3
The sons of Judah: Er and Onan and Shelah; these three were his sons by Bathshua, the Canaanite woman. And Er, Judah's oldest son, did evil in the eyes of the Lord; and he put him to death.

General references

Numbers 1:26
The generations of the sons of Judah were numbered by their families and their fathers' houses, every male of twenty years old and over who was able to go to war;

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