I Chronicles 1:32-34

Now the sons born to Keturah, Abraham’s concubine, were Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. The sons of Jokshan were Sheba and Dedan. The sons of Midian were Ephah, Epher, Hanoch, Abida, and Eldaah. All these were the children of Keturah. And Abraham begot Isaac. The sons of Isaac were Esau and Israel.