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

2 Chronicles 15:9

And he assembled Juda and Benjamin, and the strangers that dwelt with him, of Ephraim, and of Manasse, and of Symeon: for many of Israel were joined to him, when they saw that the Lord his God was with him.

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