What is the criterion for distinguishing between minor and major disbelief when disbelief is mentioned in the Qur'an?

Question:
He says: Disbelief in the Noble Qur'an sometimes means major disbelief and sometimes means minor disbelief. What is the criterion for distinguishing between them?

Answer:
The criterion is that major disbelief takes one out of the religion, such as calling upon other than Allah, slaughtering for other than Allah, making vows for other than Allah, affirming the religion or affirming the Messenger (peace and blessings be upon him), or mocking the Qur'an. This is major disbelief that takes one out of the religion. As for minor disbelief, it is like, for example,
Such as killing a soul without right, killing a believer without right; this is minor kufr (disbelief). It does not take one out of the religion, but it is a great major sin after shirk (associating partners with Allah) (Mighty and Majestic). Killing souls without right is among the greatest of major sins after shirk (associating partners with Allah) (Mighty and Majestic), and it is a type of kufr (disbelief), such as swearing by other than Allah. The Prophet (peace and blessings be upon him) said: This is minor kufr (disbelief). Yes, a little bit of riya' (showing off in worship), a little bit of riya' (showing off in worship). As for a lot, that is the riya' (showing off in worship) of the hypocrites. As for a little, that happens to a believer, and he must repent to Allah. And as for a lot, that is the riya' (showing off in worship) of the hypocrites who are . Yes.