Sahih Bukhari

Narrated Anas bin Malik:The Prophet (ﷺ) said, ""The biggest of Al-Ka`ba'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