You will find this explained in detail, in the book “Muharamat: Prohibitions which are taken too lightly”, which be published , under the heading of “Sheikh’s Books” on this website.
Definition of major sins (al-kabaa’ir)
Question 2380
I hope this is not a silly question, could you briefly try to outline all sins which are considered to be major sins?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah:
Usool al-Fiqh
Source:
Islam Q&A
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