The words of Brother Khaled al-Anbari regarding disbelief among the Murji'ah, and that it is specific to them as denial by the heart only.

Khaled al-Anbari: The faith intended in this hadith is valid faith. Even if it is a mustard seed, if faith—or rather, if belief—encounters hatred of Allah and arrogance toward the commands of Allah (Mighty and Majestic), then this arrogance undoubtedly contradicts this faith and erases it from the heart. Therefore, the Murji'ah confined disbelief to denial by the heart, and they thought, as the Shaykh al-Islam said, that anyone whom the Lawgiver declared a disbeliever was declared so only because of the absence of heart-belief in the Lord (Blessed and Exalted is He). It is well known that there is no way to know or uncover denial by the heart. Consequently, as Ibn al-Wazir said, the disbelief of a person is never established except by a specific text regarding a specific individual. The Salaf declared disbelievers those who hold this view. Iblis the accursed is a disbeliever by the text of the Qur'an, yet he was not a denier; rather, he was a rebel against Allah and arrogant. Iblis undoubtedly had belief in his heart, and yet he was a disbeliever by the text of the Noble Book. Likewise, Pharaoh and his people, as our Lord said: And He also said: So the harm that the people of Moses caused him, even though they knew by the text of the Noble Book that he was the Messenger of Allah—this harm, which stems from a lack of respect for the Messenger and a lack of loyalty to him, undoubtedly contradicts this belief. Therefore, our Lord (Blessed and Exalted is He) declared them disbelievers. And as he says...