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

Hebrews 10:7

Then said I, Lo, I come (in the volume of the book it is written of me,) to do thy will, O God.

Parallel Translations

WEBView canonical →
Then I said, ‘Behold, I have come (in the scroll of the book it is written of me) to do your will, O God.’”
World English Bible

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