Al-Fath · 48:27

27. Verily, Allah truly made the dream of His Messenger a reality; He showed it to him in his sleep and he them informed his companions of it. The dream was that he and his companions were entering the sacred house of Allah in safety from their enemies, with some of them having shaved their heads and some having only trimmed their hair, indicating the completion of their acts of pilgrimage. O believers! Allah knows some advantages that you did not know of, and so instead of making the dream a reality by letting you enter Makkah that year, He will give you a victory in the near future i.e. the signing of the treaty of Ḥudaybīyyah and the conquest of Khaybar that followed it at the hands of the believers who had witnessed Ḥudaybīyyah.