Abu Hurairah narrates that the Prophet, peace be upon him, said: “Whoever follows a funeral procession and offers the prayer for the deceased, will get one kerat 68 of reward. And whoever follows it and remains with it until the body is buried, will get two kerats of reward, the least of which is equal in weight to ‘Mount Uhud’ or he said ‘one of them is like Uhud.’ The narrator is not certain as to the exact words used by the Prophet, peace be upon him. This is reported by the group.
Khabbab reported that he asked “O ‘Abdullah Ibn ‘Umar! Did you hear what Abu Hurairah says? He says that he heard Allah’s Messenger, saying. ‘Whoever leaves his house to attend a funeral prayer, offers funeral prayer, and then follows the funeral procession until the body is buried will receive two kerats of reward, each of which is like the mountain of Uhud. And whoever offers the funeral prayer and then leaves for home (This proves that a person does not need permission of the family of the deceased to leave after attending the funeral) will get a reward like the mountain of Uhud” (Muslim). Ibn ‘Umar sent Khabbab to ‘Aishah asking her about the statement of Abu Hurairah. She said, “Abu Hurairah has told the truth.” When Ibn ‘Umar was informed about this he said, “We have indeed lost many a kerat.”