Genesis 25:1-6 New King James Version (NKJV)
Abraham and Keturah
25 Abraham again took a wife, and her name was Keturah. 2 And she bore him Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. 3 Jokshan begot Sheba and Dedan. And the sons of Dedan were Asshurim, Letushim, and Leummim. 4 And the sons of Midian were Ephah, Epher, Hanoch, Abidah, and Eldaah. All these were the children of Keturah.
5 And Abraham gave all that he had to Isaac. 6 But Abraham gave gifts to the sons of the concubines which Abraham had; and while he was still living he sent them eastward, away from Isaac his son, to the country of the east.