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

Acts 1:24

And they prayed, and said, Thou, Lord, which knowest the hearts of all men, shew whether of these two thou hast chosen,

Parallel Translations

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They prayed and said, “You, Lord, who know the hearts of all men, show which one of these two you have chosen
World English Bible

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