70 Major sins in Islam

The major sins are those act which have been forbidden by Allah in Quran and by his Messenger (SAW). A clear distinction is made between major and minor sins (53:31–32), indicating that if an individual stays away from the major sins, then they will be forgiven of the minor sins. 

70 Major sins in Islam 

1. Associating partner with ALLAH, The Most High (Shirk)
2. Killing A Human Being (Murder)
3. Sorcery (Practising Magic)
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 (Fornication)
11. Sodomy (Homosexuality)
12. Accepting Usurious Gain (Interest - Riba)
13. Wrong Consuming an Orphan's Property
14. Lying About Allah and His Prophet
15. Fleeing From the Battlefield
16. The Leader Who Misleads His Followers, the Tyrant and the Oppressor
17. Arrogance, Pride, Conceit, Vanity and Haughtiness
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
41. Disbelieving in Destiny
42. Listening to the People's Private Conversations
43. The Talebearer Who Stirs Up Enmity Between People
44. Cursing Others
45. Breaking One's Promise or Pledge
46. Believing Fortunetellers and Astrologers
47. A Wife's Rebellion Against Her Husband
48. Picture-making
49. Loudly Lamenting For the Dead or When Afflicted With an Adversity
50. Excess Against Others
51. Overburdening and Arrogance Against Others
52. Hurting One's Neighbour
53. Hurting or Reviling Muslims
54. Harming the Servants of Allah
55. Dragging the Hem of One's Garment Out of Conceit
56. Men Wearing Silk or Gold
57. Fleeing of the Slave
58. Slaughtering in Other Than Allah's Name
59. Falsely Claiming Someone is One's Father
60. Arguing, Picking Apart Another's Words, and Quarreling
61. Withholding Excess Water From Others
62. Stinting When Weighing or Measuring Out Goods and Similar Merchandise
63. Feeling Secure From Allah's Devising
64. Despairing of the Mercy of Allah and Losing of Hope
65. Forgoing the Congregational Prayer to Pray Alone Without A Legal Excuse
66. Constantly Missing the Friday and Congregational Prayer Without A Valid Excuse
67. Bringing Loss to the Bequest
68. Deception and Evil Schemes
69. Spying on the Muslims and Revealing Their Weaknesses
70. Disparaging the Companions of the Prophet

Following are the some verses from Quran forbidding major sins, 

“If you avoid the major sins of what you have been forbidden to do, We will cancel out for you your (other) evil deeds and will admit you (to Paradise) with a noble entry.” (Surah Al Nisa’ 4:31)

“Those who avoid the greatest of sins and indecencies, and forgive when they are angry.” (Surah al Shura 42:37)

“Those who avoid the greatest sins and indecencies, except for oversights, (will find that) surely your Lord is ample in forgiveness.” (Surah Al Najm 53:32)