CHAYEI SARAH
After the death of Sarah, Avraham remarries to a woman named Keturah. Rashi, following Midrash, states that she was Hagar, the woman whom he had married earlier at the behest of Sarah herself and who became the mother of Yishmael. The Torah records for us that Avraham fathered further children with Ketura and that these children left the house of Avraham to found families and clans of their own in the Middle East. There is discussion in halacha regarding these bnei Ketura and their status vis a vis the Jewish people and Avraham