Then he believed with certainty about his prophethood:
"When Prophet Mohammed – salam to him – received the revelation, his people denied him at the beginning and said: ("If our Lord pleased [to send any apostles], He would send down angels [from heaven and send them to us, instead of sending humans like ourselves]"), and they ridiculed him; so he conceived some doubt about himself, and felt himself belittled, and said (to himself): "If I had been any prophet, then they would have believed me, and have not mocked me."
So God – be glorified – revealed many ayat (or Quran revelations) to affirm his will and assure his heart, until Mohammed became certain that he was a prophet, and started to invite people to God with a strong heart and a firm will; therefore, afterwards, this aya was revealed:]"
Quran 2: 285, which means:
(The messenger [Mohammed] has now believed in [the revelation] that is revealed to him from his Lord; and the believers [have also believed];
each one [of them] believes in God, His angels, His Books and His messengers; [the believers say:] 'We make no discrimination concerning any one of His messengers.'
They say, 'We hear and we obey. Our Lord, grant to us Your forgiveness; To You will [our] final resort be [after death.]')
The detailed explanation by Mohammed-Ali Hassan Al-Hilly:
"When Prophet Mohammed – salam to him – received the revelation, his people denied him at the beginning and said: ("If our Lord pleased [to send any apostles], He would send down angels [from heaven and send them to us, instead of sending humans like ourselves]"), and they ridiculed him; so he conceived some doubt about himself, and felt himself belittled, and said (to himself): "If I had been any prophet, then they would have believed me, and have not mocked me."
So God – be glorified – revealed many ayat (or Quran revelations) to affirm his will and assure his heart, until Mohammed became certain that he was a prophet, and started to invite people to God with a strong heart and a firm will; therefore, afterwards, this aya was revealed:]"
Quran 2: 285, which means:
(The messenger [Mohammed] has now believed in [the revelation] that is revealed to him from his Lord; and the believers [have also believed];
each one [of them] believes in God, His angels, His Books and His messengers; [the believers say:] 'We make no discrimination concerning any one of His messengers.'
They say, 'We hear and we obey. Our Lord, grant to us Your forgiveness; To You will [our] final resort be [after death.]')
The detailed explanation by Mohammed-Ali Hassan Al-Hilly: