'Here I Am' in the Bible

And he came to his father and said, My father! And he said, Here I am; who are you, my son?

And the Angel of God spoke to me in a dream, saying, Jacob! And I said, Here I am.

And Israel said to Joseph, Do not your brothers feed the flock in Shechem? Come, and I will send you to them. And he said to him, Here I am.

And God spoke to Israel in the visions of the night, and said, Jacob, Jacob! And he said, Here I am.