Answered by our Shaykh, the ‘Allaamah, the Sincere Advisor, Abu ‘Abdirrahman Yahya bin ‘Ali Al-Hajoori – may Allaah preserve him –
Is there a specific number of major sins? Or is it not of a specific number?
According to the statement of Ibn ‘Abbas, may Allah be pleased with him, it’s difficult to put it in number and restrict it to one.
And the major sins are:
➖That which is incurs a curse,
➖Or [Allaah’s] Anger,
➖Or the Prophet ﷺ said concerning it: “Not from us is he who…”,
➖Or a threat in regards to the ākhira,
➖Or a punishment in the dunyā.
Translated by : Abu ‘Abdirrahman ‘Abdullaah bin Ahmed Ash-Shingaani
الكنز الثمين في الإجابة على أسئلة طلبة العلم والزائرين (5) (https://www.sh-yahia.net/show_books_40.html)
Entitled: تعداد الكبائر