Question

what had been called successors of the propet

Answer 1

With additional support, Abu Bakr was confirmed as the first caliph (religioussuccessor to Muhammad) that same year. This choice was disputed by some of Muhammad's companions, who held that Ali ibn Abi Talib, his cousin and son-in-law,had been designated thesuccessor by Muhammad at Ghadir Khumm.

Answer 2

muslim thar believe abu bakr should be the propet it also sunni muslim .