Major Kufr, and Minor Kufr and when does it apply?

[Al-Fateh]

Major Kufr, and Minor Kufr and when does it apply?

Salamu Alaikum

can one please elabore more on the matter of major and mino Kufr and when is it applied.

what conditions must it meet, and is there any specific Quranic reference or hadith to support it.

Thanks in Advance.

[Abu Hafsa]

Check Sh Salih al-Fawzaans book on Tawhid, he gives basic explanation of major and Minor Kuffr.