Matthew Henry on 1 Chronicles 5:1-17
We have here an extract out of the genealogies,
I. Of the tribe of Reuben, where we have,
1. The reason why this tribe is thus postponed. It is confessed that Reuben was the first-born of Israel, and, upon that account, might challenge the precedency; but he forfeited his birthright by defiling his father's concubine, and was, for that, sentenced not to excel, Gen 49:4. Sin lessens men, thrusts them down from their excellency. Seventh-commandment sins especially leave an indelible stain upon men's names and families, a reproach which time will not wipe away. Reuben's seed, to the last, bear the disgrace of Reuben's sin. Yet, though that tribe was degraded, it was not discarded or disinherite…
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Who dwelt in Aroer - This town was situated on the river Arnon; and Nebo was both a city and a mountain in the same country. They both lay on the other side of Jordan.
John Gill on 1 Chronicles 5:8
And Bela the son of Azaz, the son of Shema, the son of Joel,.... The pedigree of Bela, another principal man in the tribe of Reuben, is traced up to Joel the father of Shema; the same with Shemaiah, according to Kimchi and Ben Melech, 1 Chronicles 5:4
who dwelt in Aroer; which belonged to the tribe of Gad, and was rebuilt by them, Numbers 32:34 wherefore Kimchi observes, it may be interpreted, either from Aroer, or on the border of it, Bela dwelt:
even unto Nebo, and Baalmeon; of which See Gill on Numbers 32:38.
Keil & Delitzsch on 1 Chronicles 5:8
And eastward he inhabited,.... Either Bela, or the tribe of Reuben:
unto the entering in of the wilderness; the wilderness of Kedemoth, which was near to Sihon king of Heshbon, whose land the Reubenites inhabited, Deu 2:26.
from the river Euphrates; a learned man (r) thinks that this river Phrat was different from the Euphrates near Babylon, which was northward, since this was to the east or southeast:
because their cattle were multiplied in the land of Gilead; therefore their habitation was extended further, even to the river Euphrates, as in the days of David and Solomon, Sa2 8:3.
(r) Texelii Phoenix, l. 3. c. 7. p. 272.