Narrated `Abdullah bin `Amr: The Prophet said, Al-Ka`ba'ir (the biggest sins) are: To join others (as partners) in worship with Allah, to be undutiful to one's parents, or said, to take a false oath. (The sub-narrator, Shu`ba is not sure) Mu`adh said: Shu`ba said, Al-Ka`ba'ir (the biggest sins) are: (1) Joining others as partners in worship with Allah, (2) to take a false oath (3) and to be undutiful to one's parents, or said, to murder (someone unlawfully).