Genesis 35:22 New King James Version (NKJV)
22 And it happened, when Israel dwelt in that land, that Reuben went and lay with Bilhah his father’s concubine; and Israel heard about it.
Jacob’s Twelve Sons
Now the sons of Jacob were twelve:
Genesis 35:22 New International Version (NIV)
22 While Israel was living in that region, Reuben went in and slept with his father’s concubine Bilhah, and Israel heard of it.
Jacob had twelve sons: