'Here Am I' in the Bible

And Isaac spoke to Abraham his father and said, My father. And he said, Here am I, my son. And he said, Behold the fire and the wood. But where is the lamb for a burnt offering?

And the Angel of Jehovah called to him from the heavens and said, Abraham! Abraham! And he said, Here am I.

And he said to him, Behold, here am I. And he said, Behold now, I am old, I do not know the day of my death.