Genesis 35:23-26

Now Jacob had twelve sons: the sons of Leah: Reuben, Jacob's first son, and Simeon and Levi and Judah and Issachar and Zebulun; The sons of Rachel: Joseph and Benjamin; The sons of Bilhah, Rachel's servant: Dan and Naphtali; The sons of Zilpah, Leah's servant: Gad and Asher; these are the sons whom Jacob had in Paddan-aram.