The Prophet's Final Sickness

Islam is not just an Arabian phenomenon. He wanted the Sahaba to go forth and especially he wanted them to go to the holiest of Holies after Mecca and Medina. But with regards to this specific expedition, it was halted for the time being and the Prophet ﷺ fell sick. This opened up the way for all future conquests. That's why the first conquest in the reign of Abu Bakr will begin to take place against the Roman Empire,. And as you know Jerusalem on the first day of the Khilaf of Rumor.