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

1 Samuel 13:2

And Saul chooses for himself three thousand men of the men of Israel: and there were with Saul two thousand who were in Machmas, and in mount Bæthel, and a thousand were with Jonathan in Gabaa of Benjamin: and he sent the rest of the people every man to his tent.

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