'I Am He' in the Bible

And again he says, I will put my faith in him. And again, See, I am here, and the children which God has given to me.

Then said I, Behold, I am here (in the head of the book it was written of me,) O God, to do thy will.

Then he said, Behold, I am here to do, O God, thy will. He takes away the first, that he might set up the second.