Bilhah: Rachael's Servant: Reuben's Incest With
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Genesis 35:22
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:
Genesis 49:4
Uncontrolled as the waters, you will no longer excel, because you went up to your father’s bed, onto my couch, and defiled it.