Narrated Abdullah bin Umar (may Allah be pleased with them): The Messenger of Allah (peace and blessings of Allah be upon him) said: Indeed, among the greatest of sins is that a person curses his own parents. It was asked: O Messenger of Allah (peace and blessings of Allah be upon him)! How can a person curse his own parents? The Prophet (peace and blessings of Allah be upon him) said: He abuses another person's parents, so that person (in response) abuses his parents.