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

Ephesians 1:19

And what is the exceeding greatness of his power to us-ward who believe, according to the working of his mighty power,

Parallel Translations

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and what is the exceeding greatness of his power toward us who believe, according to that working of the strength of his might
World English Bible

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