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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Beerah his son - After their separation from the house of David the ten tribes continued to have princes of the tribes; and this continued till the time that Tiglath-pileser carried them captives into Assyria. At that time Beerah was their prince or chief; and with him this species of dominion or precedency terminated. According to the Targum, Beerah was the same as Baruch the prophet.
John Gill on 1 Chronicles 5:7
And his brethren by their families,.... Either the brethren of Beerah, or the rest of the posterity of Reuben:
(when the genealogy of their generations was reckoned;) either in the times of Jotham and Jeroboam, 1 Chronicles 5:17 or at the time of their captivity, as in the preceding verse:
were the chief, Jehiel, and Zechariah; these were the principals or heads of their families.
Keil & Delitzsch on 1 Chronicles 5:7
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, Ch1 5:4
who dwelt in Aroer; which belonged to the tribe of Gad, and was rebuilt by them, Num 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 Num 32:38.