Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
LXX

1 Chronicles 21:17

And David said to God, [Was it] not I [that] gave orders to number the people? and I am the guilty one; I have greatly sinned: but these sheep, what have they done? O Lord God, let thy hand be upon me, and upon my father's house, and not on thy people for destruction, O Lord!

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