Genesis 25:1-2, 5-6

Abraham married a second time; his new wife was named Keturah. She gave birth to Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah.

But Abraham gave everything he possessed to Isaac. While he was still living, he gave gifts to the sons he had by his concubines, but then sent them away to the country of the east, putting a good distance between them and his son Isaac.