Sayyiduna Abu Bakrah (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said, "Shall I not inform you of the greatest of sins?" He repeated this three times. The companions said, "Yes, O Messenger of Allah." He said, "Associating partners with Allah, disobedience to parents." At that time, he was reclining, but then he sat up straight and said, "And yes, false testimony as well." Sayyiduna Abu Bakrah says that the Prophet (peace and blessings be upon him) repeated this statement so many times that we began to say, "We wish he would remain silent."

Sayyiduna Anas (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) was asked about the major sins, so he said: Associating partners with Allah, disobeying parents, taking a life, and giving false testimony.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: Avoid the seven destructive sins. The companions asked, "O Messenger of Allah, what are they?" He replied: Associating partners with Allah, practicing magic, killing a soul which Allah has forbidden except by right, consuming usury, consuming the property of an orphan, fleeing from the battlefield, and slandering chaste, innocent, believing women.

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.