Major Sins in Islam

Major Sins: Major sins are difined as what is forbidden by Allah and His Messenger in the Quran and the Sunnah.
Ref: An Nisaa:31, Ash Shura: 37, An Najm:32

List of major sins:
1. Ascribing Associates to Allah, The Most High (Shirk)
2. Killing a human being

3. Sorcery
4. Not performing the prayer
5. Not paying Zakat
6. Breaking one's fast during ramadan without an excuse
7. Not performing the Hajj when able to
8. Showing disrespect to one's parents
9. Severing the ties of one's relatives
10. Adultery
11. Sodomy
12. Accepting usurious gain
13. Worng consuming an orphan's property
14. Lying about the prophet
15. Fleeing from the battle field
16. The leader who misleads his followers, the Tyrant and the Oppressor
17. Arrogance, Pride, Conceit, Vanity and Houghtiness
18. Bearing false witness
19. Drinking Alcohol
20. Gambling (Qimar)
21. Accusing a woman of Adultery
22. Misappropriating Spoils of War, Muslim funds or Zakat
23. Theft
24. Highwaymen who menace the road
25. The Engulfing Oath
26. Taking people's property through falsehood
27. Collecting taxes
28. The consumption of Haram
29. Suicide
30. Telling lies
31. The dishonest judge
32. Bribery
33. Women imitating men and vice versa
34. The Pimp and the one who permits his wife to fornicate
35. Marrying solely to return to the previous husband
36. Not freeing oneself of all traces of urine.
37. Showing off in good work
38. Learning sacred knowledge for the sake of this world or concealing it.
39. Breach of faith
40. Reminding recipients of one's charity to them.