Sahih Bukhari Volume 009, Book 083, Hadith Number 009.

Narrated By 'Abdullah bin 'Amr : The Prophet said, "Al-Kaba'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-kaba'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).
 

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