A secondary wife or concubine taken by Abraham, whether in Sarah's lifetime or afterward is uncertain (Genesis 25:1; 1 Chronicles 1:28; 1 Chronicles 1:32). Their sons were Zimran, Jokshan, Medan, Midian, Ishbak, Shuah; they spread through the desert E. to the Persian gulf. Hagar's son Ishmael's posterity was the elder branch of the "sons of the concubines."
From the co-author of the classic Jamieson, Fausset and Brown Commentary, Fausset's Bible Dictionary stands as one of the best single-volume Bible encyclopedias ever written for general use. The author's writing style is always clear and concise, and he tackles issues important to the average student of the Bible, not just the Biblical scholars. This makes Fausset an excellent tool for both everyday Bible study and in-depth lesson or sermon preparation.Wikipedia
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