Genesis 35:22-23 And it happened, while Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine and Israel heard of it. Now the sons of Jacob were twelve.

MLV⁽ⁱ⁾ ²² And it happened, while Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine and Israel heard of it.
Now the sons of Jacob were twelve. ²³ The sons of Leah were : Reuben, Jacob's firstborn and Simeon and Levi and Judah and Issachar and Zebulun.