The major sins are those acts which have been forbidden by Allah in the Quran and by His Messenger (SAW) in the Sunnah (practise of the Prophet), and which have been made clear by the actions of the first righteous generation of Muslims, the Companions of the Prophet (SAW). Allah Most High says in His Glorious Book: If you avoid the major (part) of what you have been forbidden (to do), We will... more.