Ishbak: Son of Abraham and Keturah
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Genesis 25:2
and she bore him Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah.
1 Chronicles 1:32
The sons born to Keturah, Abraham’s concubine: Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah. The sons of Jokshan: Sheba and Dedan.