Imam Al-Layth Bin Saad relates that the popular companion by the name of Zaid Bin Harithah (RA) rented a mule from a man in the city of Taif. The owner stipulated that he be permitted to rest the mule wherever he pleases. So the owner decided to lead the mule into a deserted valley. Therein, Zaid found numerous dead bodies.
Realizing what he was in for, Zaid requested from this man to allow him to pray two Rakahs (units of prayer). The man replied, “Pray; for all these [dead] people prayed before you and their prayers did not benefit them in the least!”