سنن ابن ماجه

It was narrated that ‘Abdullah bin Malik bin Buhainah said: “The Prophet (ﷺ) passed by a man who was praying when the Iqamah for Subh prayer had been called, and he said something to him, I do not know what he said. When he finished, we surrounded the man and asked him: ‘What did the Messenger of Allah (ﷺ) say to you?’ He said: ‘He said to me: “Soon one of you will pray Fajr with four Rak’ah.’”