When did the message of Prophet Muhammad (peace be upon him) begin to encompass both humankind and jinn? And was this comprehensiveness from the beginning of the prophethood, or at a later stage? If it was not from the beginning, then to whom was his message directed when it started?

It is obligatory to believe that the Prophet, peace and blessings be upon him, was sent to all mankind. His call began secretly for three years, then he declared it openly. He started by inviting his closest relatives, generally and specifically, to begin with those nearest so that the proof would extend to others. Then he invited people in general. These are the stages of the prophetic call: the secret call, then the open call to the closest relatives, then the call to all other people.