Commentaries:
Barnes' Notes
Jabbok (now Wady Zerka: compare Genesis 32:22) runs eastward under Rabbah of the children of Ammon, thence westward, and reaches the Jordan, 45 miles north of the Arnon. It was between Rabbah and Gerasa that it formed the Ammonite boundary.
Other Barnes' Notes entries containing Numbers 21:24:
Genesis 15:1-21
Joshua 13:8-33
Amos 1:13
Zephaniah 2:8
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