Berean Study Bible
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:

King James Bible
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:

American Standard Version
And it came to pass, 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:

Darby Bible Translation
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 of it. And the sons of Jacob were twelve.

Douay-Rheims Bible
And when he dwelt in that country, Ruben went, and slept with Bala, the concubine of his father: which he was not ignorant of. Now the sons of Jacob were twelve.

English Revised Version
And it came to pass, 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:

Young's Literal Translation
and it cometh to pass in Israel's dwelling in that land, that Reuben goeth, and lieth with Bilhah his father's concubine; and Israel heareth.