Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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2 Samuel 21:8

But the king took the two sons of Rizpah the daughter of Aiah, whom she bore to Saul, Armoni and Mephibosheth; and the five sons of Merab the daughter of Saul, whom she bore to Adriel the son of Barzillai the Meholathite.

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