Sounds Familiar

As he sees the flame, Moses hears a voice. In The Prince of Egypt, it is a voice he hears for the first time, yet it is as familiar as his own [0:43; forty-three minutes into the film]. It is the Lord's, surely, and it is, indeed, Moses' own. (Actor Val Kilmer, who speaks for Moses in the film, also gives voice to the Almighty.) This reflects the Kabbalistic idea that we each hear God in our own voice.

Midrash Rabbah also describes the voice of God at the bush as familiar to Moses, not Moses' own, but his father.