Thus, after Abram had lived ten years in the land of Canaan, his wife Sarai took her maid, Hagar the Egyptian, and gave her to her husband Abram to be his wife.
So Sarai said to Abram: “This outrage against me is your fault. I myself gave my maid to your embrace; but ever since she knew she was pregnant, I have lost stature in her eyes. May the Lord decide between you and me!”
To the sons of his concubines, however, he gave gifts while he was still living, as he sent them away eastward, to the land of Kedem, away from his son Isaac. Death of Abraham.
so Esau went to Ishmael, and in addition to the wives he had, married Mahalath, the daughter of Abraham’s son Ishmael and sister of Nebaioth. Jacob’s Dream at Bethel.
While Israel was encamped in that region, Reuben went and lay with Bilhah, his father’s concubine. When Israel heard of it, he was greatly offended. The sons of Jacob were now twelve.