The Prophet said: "The major sins are: Associating others with Allah, disobeying parents, killing a soul (murder) and swearing a false oath knowingly."
Sunan an-Nasa'i Book 37, Hadith 46
← Previous Hadith "I heard Anas say: 'The Messenger of Allah said: The major sins are: Associating others with Allah (Shirk), disobeying one's parents, killing a soul (murder) and speaking falsely.'"

Sunan an-Nasa'i Book 37, Hadith 45 Next Hadith → His father - who was one of the Companions of the Prophet - told him: "A man said: 'O Messenger of Allah, what are the major sins?' He said: 'They are seven; the most grievous of which are associating others with Allah, killing a soul unlawfully and fleeing (from the battlefield) on the day of the march.'" It is abridged.

Sunan an-Nasa'i Book 37, Hadith 47