Then she spake, saying, they were wont to speak in old time,.... It was a common saying, a proverbial expression among the ancient sages:
saying, they shall surely ask counsel at Abel, and so they ended the matter. Abel, it seems, had been a city so famous for wise and prudent men, that it was common for the inhabitants of other cities, in the several parts of the kingdom, when any controversy arose among them, to say to one another, since we cannot agree this matter among ourselves, let us go to Abel, and take advice there, and leave it to their arbitration; and so they did, and things were presently brought to an issue, and happily concluded; nay, when the king had a mind to make a decree…
Keil & Delitzsch on 2 Samuel 20:1-22
Sheba's Rebellion. - Sa2 20:1. There happened to be a worthless man there, named Sheba, a Benjaminite. He blew the trumpet, and said, "We have no part in David, nor inheritance in the son of Jesse. Every man to his tents, O Israel!" "To his tents," i.e., to his home, as in Sa2 19:9, etc.
Sa2 20:2
All the men of Israel responded to this call, and went up (to the mountains) away from David and after Sheba; but the men of Judah adhered to their king from the Jordan to Jerusalem. The construction of דּבק with ועד ... מן is a pregnant one: they adhered to and followed him. The expression "from Jordan" does not prove that Sheba's rebellion broke out at the Jordan itself, and before David's arrival…
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