Genesis 35:22-26

Thomson(i) 22 And while Israel dwelt in that land, Reuben went and lay with Balla the concubine of his father Jacob, and Israel heard of it, and it appeared evil in his sight. Now the sons of Jacob were twelve. 23 The sons of Leia, Reuben, Jacob's first born, Symeon, Levi, Judas, Issachar, Zabulon: 24 and the sons of Rachel, Joseph and Benjamin; 25 and the sons of Balla, Rachel's handmaid, Dan and Nephthaleim: 26 and the sons of Zelpha, Leia's handmaid, Gad and Aser. These were the sons of Jacob, who were born to him in Syrian Mesopotamia.