Exodus 3:2-4

2And the Angel of Jehovah appeared to him in a flame of fire out of the midst of a thorn-bush: and he looked, and behold, the thorn-bush burned with fire, and the thorn-bush was not being consumed.

3And Moses said, Let me now turn aside and see this great sight, why the thorn-bush is not burnt.

4And Jehovah saw that he turned aside to see, and 1God called to him out of the midst of the thorn-bush and said, Moses, Moses! And he said, Here am I.