'It is I' in the Bible

It is I: behold, my covenant is with thee, and thou shalt be a father of a multitude of nations.

And he said, Art thou really my son Esau? And he said, It is I.

For it was little that thou hadst before me, and it is increased to a multitude, and Jehovah has blessed thee from the time I came; and now, when shall I also provide for my house?

And Judah said to his brethren, What profit is it that we kill our brother and secrete his blood?