Genesis 25:1-8
1 Abraham had taken another wife, whose name was Keturah. 2 She bore him Zimran, Jokshan, Medan, Midian, Ishbak and Shuah. 3 Jokshan was the father of Sheba and Dedan; the descendants of Dedan were the Ashurites, the Letushites and the Leummites. 4 The sons of Midian were Ephah, Epher, Hanok, Abida and Eldaah. All these were descendants of Keturah.
5 Abraham left everything he owned to Isaac. 6 But while he was still living, he gave gifts to the sons of his concubines and sent them away from his son Isaac to the land of the east.
7 Abraham lived a hundred and seventy-five years. 8 Then Abraham breathed his last and died at a good old age, an old man and full of years; and he was gathered to his people.