Genesis 35:23 lists the sons born to Leah, who was one of Jacob’s wives: Reuben (Jacob’s firstborn), Simeon, Levi, Judah, Issachar, and Zebulun. This verse is part of a genealogical summary, showing the family line that came from Leah.
In the context of Genesis, this verse is part of a section where Jacob’s children are being listed by their mothers. The passage serves to clarify the family structure and lineage of Jacob, who is also called Israel. These six sons of Leah would later become the ancestors of six of the twelve tribes of Israel, which is important for understanding the rest of the biblical narrative.