'It is I' in the Bible

if a family be divided against it self, it is impossible for it to subsist.

for they all saw him, and were greatly terrified. but at the instant Jesus spoke to them, and said, take courage, it is I, don't be afraid.

Jesus observing the people came crowding to him, rebuked the evil spirit, saying, thou dumb and deaf spirit come out of the child, never to enter more, it is I command it.