Matthew Henry on 1 Chronicles 1:28–end
All nations but the seed of Abraham are already shaken off from this genealogy: they have no part nor lot in this matter. The Lord's portion is his people. Of them he keeps an account, knows them by name; but those who are strangers to him he beholds afar off. Not that we are to conclude that therefore no particular persons of any other nation but the seed of Abraham found favour with God. It was a truth, before Peter perceived it, that in every nation he that feared God and wrought righteousness was accepted of him. Multitudes will be brought to heaven out of all nations (Rev 7:9), and we are willing to hope there were many, very many, good people in the world, that lay out of the pale of G…
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Reuel--a powerful branch of the great Aeneze tribe, the Rowalla Arabs.
Shammah--the great tribe Beni Shammar. In the same way, the names of the other kings and dukes are traced in the modern tribes of Arabia. But it is unnecessary to mention any more of these obscure nomads, except to notice that Jobab (Ch1 1:44), one of the kings of Edom, is considered to be Job, and that his seat was in the royal city of Dinahab (Gen 36:32; Ch1 1:43), identified with O'Daeb, a well-known town in the center of Al Dahna, a great northern desert in the direction of Chaldea and the Euphrates [FORSTER].
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Adam Clarke on 1 Chronicles 1:32
Keturah, Abraham's concubine - Abraham's pilegesh, or wife of the second rank; she was neither whore, harlot, nor concubine, in our sense of these words.
John Gill on 1 Chronicles 1:38
And the sons of Seir,.... This man and his posterity were not of the race of Esau, but are mentioned because they were a family into which Esau, and a son of his, married, and whose possessions he and his obtained. The account from hence, to the end of 1 Chronicles 1:42 is the same with Genesis 36:20, with some little variation of names.