[SHAYAN]

The Prophet (peace be upon him) was asked about the 'Grave Sins', and He (peace be upon him) replied,

"They are:

(1 ) To join others in worship with Allah,

(2) To be undutiful to one's parents,

(3) To kill a person ( which Allah has forbidden to kill)

(4) And to give a false witness."

Sahih Al-Bukhari Hadith 3.821, Narrated by Anas (r.a.)