Sahih Bukhari Volume 009, Book 083, Hadith Number 010.

Narrated By Anas bin Malik : The Prophet said, "The biggest of Al-Kaba'ir (the great sins) are:
  1. To join others as partners in worship with Allah,
  2. To murder a human being,
  3. To be undutiful to one's parents
  4. And to make a false statement," or said, "to give a false witness."

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