It is narrated from Hazrat Ya'la (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) passed by a grave and said that the one in this grave is being punished, but not for any major reason. Then the Prophet (peace and blessings be upon him) asked for a branch, placed it on the grave, and said: As long as it remains fresh, it is possible that the punishment will be lightened for him during that time.