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

1 Chronicles 21:15

And God sent an angel to Jerusalem to destroy it: and as he was destroying, the Lord saw, and repented for the evil, and said to the angel that was destroying, Let it suffice thee; withhold thine hand. And the angel of the Lord stood by the threshing-floor of Orna the Jebusite.

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