The sons of Leah; Reuben, Jacob's firstborn, and Simeon, and Levi, and Judah, and Issachar, and Zebulun: The sons of Leah - The children are arranged under their respective mothers, and not in order of their birth.
Related Commentaries of Genesis 35:23
Genesis 35:23
23 The sons of Leah; Reuben, Jacob's firstborn, and Simeon, and Levi, and Judah, and Issachar, and Zebulun: