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Abraham and Keturah
13And these were the names of the sons of Ishmael, by their names, according to their generations: The firstborn of Ishmael, Nebajoth; then Kedar, Adbeel, Mibsam, 14Mishma, Dumah, Massa, 15Hadar, Tema, Jetur, Naphish, and Kedemah.
Genesis 25:13-15 (NKJV)