The Prophet (PBUH) had made a prophecy that none of the people who were alive on that night would live beyond the end of the century. 'None of the people on the surface of the earth will survive' has been interpreted as "those who had seen him and known him would not stay alive after a hundred years of his death from that night. This was true, for the last Companion of the Prophet, Abu Tufail Amir bin Wa'ilah, died in 110 A.H., i.e., exactly one hundred years after the Prophet's prophecy.