section_path: Companionship of Muhammad
section_name: Companionship of Muhammad
paragraph_text: Companionship of Muhammad
  
  When tipped off about an assassination plot in 622, Muhammad escaped to Yathrib, now known as Medina, but Ali stayed behind as his decoy. That Ali risked his life for Muhammad is said to be the reason for the revelation of the Quranic passage, "But there is also a kind of man who gives his life away to please God." This emigration marks the beginning of the Islamic calendar (AH). Ali too escaped Mecca after returning the goods entrusted to Muhammad there. Later in Medina, Muhammad selected Ali as his brother when he paired Muslims for fraternity pacts. Around 623–625, Muhammad gave his daughter Fatima to Ali in marriage, aged about twenty-two at the time. Muhammad had earlier turned down marriage proposals for Fatima by some of his companions, notably, Abu Bakr and Umar.