Genesis 35:23 in the World English Bible
The sons of Leah: Reuben (Jacob’s firstborn), Simeon, Levi, Judah, Issachar, and Zebulun.
Context
22 And it came to pass, when Israel dwelt in that land, that Reuben went and lay with Bilhah his father’s concubine: and Israel heard it. Now the sons of Jacob were twelve:
23 The sons of Leah; Reuben, Jacob’s firstborn, and Simeon, and Levi, and Judah, and Issachar, and Zebulun:
24 The sons of Rachel; Joseph, and Benjamin: