Original sentence: According to Shi'a scholars, before Muhammad died he had received a divine command to appoint Ali as his successor.Ali was born at Mecca where his father, Abu Talib, was an uncle of the Prophet.He publicly announced Ali's succession at the resting-place of Ghadir Khum, between Mecca and Medina, to a large number of Muslims who had accompanied him on what was to be his last pilgrimage to Mecca.While Ali was slow to pledge allegiance to Abu Bakr, once having pledged he gave the new caliph his full support -- as he did with Umar and Uthman, the caliphs who succeeded Abu Bakr
Edited sentence: According to Shi'a scholars, Muhammad had divine command to appoint Ali as his successor.Ali was born at Mecca (in the house of Allah, Holy Kaaba) where his father, Abu Talib, was an uncle of the Prophet.Ali's succession at the resting-place of Ghadir Khum, between Mecca and Medina, to a large number of Muslims who had accompanied him on what was to be his last pilgrimage to Mecca.He publicly announced several times including the famous annoucement of Ghadir Khum.However, Shia dispute this claim, as Ali never pledge allegiance to Abu Bakr, Umar or Uthman according to them.While accordingly to Sunni, Ali was slow to pledge allegiance to Abu Bakr, once having pledged he gave the new caliph his full support -- as he did with Umar and Uthman, the caliphs who succeeded Abu Bakr