'Here I Am' in the Bible

And again [He says],“My trust and confident hope will be placed in Him.”And again,“Here I am, I and the children whom God has given Me.”

“Then I said, ‘Behold, I have comeTo do Your will, O God—[To fulfill] what is written of Me in the scroll of the book.’”

then he says, "Here I am: I have come to do your will." He does away with the first to establish the second.