The words of Brother Khaled al-Anbari regarding disbelief, mentioning its two categories, major and minor, and explaining the types of major disbelief, which are six, and discussing the first type, which is disbelief by denial.

Khaled al-Anbari: ... We have finished the topic of faith, albeit in a very brief manner, but given the time you have allowed us, we will address the topic of declaring someone a disbeliever. There is no doubt that disbelief is of two types: major disbelief and minor disbelief. The purpose of our discussion with you is major disbelief, which expels one from the religion. There is no doubt that the disbelief that expels one from the religion, as held by the people of the Sunnah and the community, is of six types, not just one: "denial, rejection, stubbornness, hypocrisy, turning away, and doubt". This diversity in the types of disbelief is due to the difference in people's positions toward the truth with which Allah sent the messengers and sent down the books. Some people disbelieve with their tongues and their hearts, and this is disbelief by denial. The majority of these people are those who do not have a comprehensive understanding of what Allah has sent down, so they disbelieved and denied. What indicates this is the statement of our Lord: And some people are certain in their hearts that it is the truth, but they conceal it and deny it with their tongues.