Abu Hurairah narrated that the Messenger of Allah(s.a.w) said: "The night and the day shall not go away until a man called Jahjaah among the Mawali reigns".
The Prophet Muhammad's prediction of a man named Jahjah coming into power amongst the Mawali serves as an example of how Allah knows all things and reveals them through His Messengers so that we can prepare ourselves for what is yet to come according to His plan for us. It also teaches us about patience and trust in Allah's plan as we wait for this prophecy to be fulfilled at its due time without rushing or worrying about it too much before then.