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

1 Samuel 6:19

And the sons of Jechonias were not pleased with the men of Bæthsamys, because they saw the ark of the Lord; and [the Lord] smote among them seventy men, and fifty thousand men: and the people mourned, because the Lord had inflicted on the people a very great plague.

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