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

1 Samuel 13:2

Saul chose him three thousand men of Israel; whereof two thousand were with Saul in Michmash and in mount Beth–el, and a thousand were with Jonathan in Gibeah of Benjamin: and the rest of the people he sent every man to his tent.

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