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When the angel come to the prophet salla Allah alaihi wa salam as an angel our prophet were very much affected while when the angel comein a shape of man it wa easer :
`A'ishah, the Mother of the Believers, narrated, "The commencement of the divine inspiration to the Prophet (peace and blessing be upon him) started in the form of good dreams which came true like bright daylight, and then the love of seclusion was bestowed upon him. He used to go in seclusion in the cave of Hiraa' where he used to worship Allah alone continuously for many days before his desire to see his family. He used to take enough food for many nights and then come back to (his wife) Khadijah to take his food likewise again. Suddenly the truth descended upon him while he was in the cave of Hiraa'.
The angel came to him and asked him to read. The Prophet replied, "I do not know how to read." The Prophet added, "The angel caught me (forcibly) and pressed me so hard that I could not bear it any more. He then released me and again asked me to read. I replied, "I do not know how to read". Thereupon he caught me again and pressed me a second time till I could not bear it any more. He then released me and again asked me to read, but again I replied, "I do not know how to read" (or what shall I read?). Thereupon he caught me for the third time and pressed me, and then released me and said, (Read, in the name of Your Lord, who created, created man from a clot. Read! And Your Lord is the most bountiful. ) "
The narration goes on to tell us that the Prophet went back to his wife Khadijah and recounted to her his dreadful experience. She comforted him and both of them consulted Waraqah ibn Nawfal, Khadijah's relative and a learned Christian, about it. Waraqah told Muhammad that he had encountered the very one whom Allah had sent to Moses, and that he would be driven out by his people.
`A'ishah, the Mother of the Believers, narrated that Al-Harith ibn Hisham asked the Prophet (peace and blessing be upon him): "O Allah's apostle. How is the divine inspiration revealed to you?" The Prophet (peace and blessing be upon him) replied,
"Sometimes it is "revealed" like the ringing of a bell, this is the hardest of all, and then it passes off after I have grasped what is inspired. Sometimes the Angel comes in the form of a man and talks to me and I grasp whatever he says." (Al-Bukhari)
The First Received Revelation
The first revelation that Prophet Muhammad received is the first verses from Surat Al-`Alaq:
(Read, in the name of Your Lord, who created, created man from a clot (`alaq). Read! And Your Lord is the most bountiful, Who taught (to write) with the pen. Taught man what he knew not. ) (Al-`Alaq 96:1–5)