The events in connection with which this Surah was sent down began like this: One day the Holy Prophet saw in a dream that he had gone to Makkah with his Companions and had performed the umrah there. Obviously, the Prophet's dream could not be a mere dream and fiction for it is a kind of Divine inspiration as Allah Himself has confirmed in verse 27 below and said that He Himself had shown that dream to His Messenger. Therefore, it was not merely a dream but a Divine inspiration that the Holy Prophet had to obey and follow.
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