Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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1 Samuel 15:9

But Saul and the people spared Agag and the best of the sheep, of the cattle, of the fat calves, of the lambs, and all that was good, and were not willing to utterly destroy them; but everything that was vile and refuse, that they destroyed utterly.

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