Passage: Whenever Muhammad was present or very close by, his presence was indicated by light organ music. His words, as he spoke them, were repeated by someone else such as Hamza, Zayd or Bilal. When a scene called for him to be present, the action was filmed from his point of view. Others in the scene nodded to the unheard dialogue or moved with the camera as though moving with Muhammad.

Question: Who were some of the individuals who repeated Muhammad's words?
Hamza, Zayd or Bilal