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

1 Chronicles 15:12

and said to them, Ye [are] the heads of the families of the Levites: sanctify yourselves, you and your brethren, and ye shall carry up the ark of the God of Israel, [to the place] which I have prepared for it.

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