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

2 Chronicles 13:9

Did ye not cast out the priests of the Lord, the sons of Aaron, and the Levites, and make to yourselves priests of the people of any [other] land? whoever came to consecrate himself with a calf of the herd and seven rams, he forthwith became a priest to that which is no god.

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