Psalm 40:8 in the King James Version
I delight to do thy will, O my God: yea, thy law is within my heart.
Context
7 Then I said, “Behold, I have come. It is written about me in the book in the scroll.
8 I delight to do your will, my God. Yes, your law is within my heart.”
9 I have proclaimed glad news of righteousness in the great assembly. Behold, I will not seal my lips, LORD, you know.