Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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2 Samuel 15:34

but if you return to the city, and tell Absalom, ‘I will be your servant, O king. As I have been your father’s servant in time past, so I will now be your servant; then you will defeat for me the counsel of Ahithophel.’

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