1 Chronicles 1:32-34

Now the sons of Keturah, Abraham’s concubine: she gave birth to Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. The sons of Jokshan: Sheba and Dedan. The sons of Midian: Ephah, Epher, Hanoch, Abida, and Eldaah. All these are the sons [and grandsons] of Keturah. Abraham became the father of Isaac. The sons of Isaac: Esau and Israel (Jacob).