Ishbak (Hebrew: ish'băk; "he will leave; leaving"), also spelt Jisbak [1] and Josabak.[2] According to the Bible he was the fifth son of Abraham, the patriarch of the Israelites, and Keturah whom he wed after the death of Sarah.[3][4] Ishbak had five brothers, Zimran, Jokshan, Medan, Midian and Shuah.[5]
Josephus tells us that "Abraham contrived to settle them in colonies; and they took possession of Troglodytis and the country of Arabia the Happy, as far as it reaches to the Red Sea."[6] Abraham in all probability, tried to keep them apart from Isaac to avoid conflict while fulfilling God's commission to spread out and inhabit the globe.[7][8][9] Little else is known about him, but his descendants may be the people identified in a cuneiform inscription to a people known as Jasbuqu.[10]