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

2 Chronicles 21:13

but hast walked in the ways of the kings of Israel, and hast caused Juda and the dwellers in Jerusalem to go a-whoring, as the house of Achaab caused [Israel] to go a-whoring, and thou hast slain thy brethren, the sons of thy father, who were better than thyself;

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