Commentaries:
Barnes' Notes
The way in which the writer here refers to the history of the league with the Gibeonites Josh. 9 shows that the Book of Joshua was not a part of the same work as the Books of Samuel.
Of the Amorites - The Gibeonites were Hivites Joshua 9:7; Joshua 11:19; and in many enumerations of the Canaanite nations the Hivites are distinguished from the Amorites. But "Amorite" is often used in a more comprehensive sense, equivalent to "Canaanite" (as Genesis 15:16; Deuteronomy 1:27), and denoting especially that part of the Canaanite nation which dwelt in the hill country Numbers 13:29; Deuteronomy 1:7, Deuteronomy 1:20, Deuteronomy 1:24, and so includes the Hivites.
Other Barnes' Notes entries containing 2 Samuel 21:2:
Genesis 10:6-20
Joshua 9:3
Judges 21:18
2 Samuel 4:2
2 Samuel 21:15
Amos 2:9
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