Explanation

Allah, the Almighty, is kind towards His slaves and He wills to facilitate for them the means of forgiveness. Hence, the Prophet (may Allah's peace and blessings be upon him) urged us to join the funeral procession and prayer, for this is a type of intercession that leads to mercy. Allah, the Almighty, has made the reward of whoever attends the funeral prayer equal to one Qirāt, and whoever attends the funeral till burial another Qirāt of reward. Such is a great reward whose specific amount is known to our Lord. Since the Companions (may Allah be pleased with him) had no knowledge about how much this reward was, the Prophet (may Allah's peace and blessings be upon him) tried to bring it closer to their understanding, stating that each Qirāt is like a huge mountain. Such an act entails a great reward because it involves the fulfillment of the rights of one's fellow Muslims, supplication for them, a reminder of death and the Hereafter, giving solace and comfort to the relatives of the deceased, as well as other benefits.