Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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2 Samuel 21:2

The king called the Gibeonites and said to them (now the Gibeonites were not of the children of Israel, but of the remnant of the Amorites, and the children of Israel had sworn to them; and Saul sought to kill them in his zeal for the children of Israel and Judah);

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