New Defender's Study Bible Notes
25:1 Keturah. The home and background of Keturah are unknown. Like Hagar, she is called a concubine (Genesis 25:6; I Chronicles 1:32) to emphasize that her sons were not to inherit the promises centered in Isaac. However, God had also promised (Genesis 17:4) that Abraham would be a father of many nations. When his body was miraculously rejuvenated at age one hundred to father Isaac, he remained “young” for many more years, eventually begetting six more sons of the younger Keturah.