Parallel
Genesis 35:22
Brenton's English Septuagint · Berean Standard Bible
And it came to pass when Israel dwelt in that land, that Ruben went and lay with Balla, the concubine of his father Jacob; and Israel heard, and the thing appeared grievous before him. And the sons of Jacob were twelve.
While Israel was living in that region, Reuben went in and slept with his father’s concubine Bilhah, and Israel heard about it. Jacob had twelve sons: