Genesis 46:15
"These be the sons of Leah, which she bare unto Jacob in Padanaram, with his daughter Dinah: all the souls of his sons and his daughters were thirty and three."
Cross References (ranked by relevance)
Genesis 25:20
And Isaac was forty years old when he took Rebekah to wife, the daughter of Bethuel the Syrian of Padanaram, the sister to Laban the Syrian.
Genesis 35:23
The sons of Leah; Reuben, Jacob’s firstborn, and Simeon, and Levi, and Judah, and Issachar, and Zebulun:
1 Chronicles 2:1
These are the sons of Israel; Reuben, Simeon, Levi, and Judah, Issachar, and Zebulun,