Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) said:
The belief that the well-known obligations are obligatory and that the well-known prohibitions are forbidden is one of the most important basic principles of faith, and the one who rejects that is a kaafir according to scholarly consensus.
Majmoo’ al-Fataawa, 12/497.
Ibn Qudaamah (may Allaah have mercy on him) said:
Whoever believes that something is permissible when there is consensus that it is forbidden and the ruling thereon is well known among the Muslims and the texts leave no room for doubt concerning it – such as pig meat, adultery and the like, concerning which there is no difference of scholarly opinion – is guilty of kufr.
Al-Mughni, 12/276
The belief that the well-known obligations are obligatory and that the well-known prohibitions are forbidden is one of the most important basic principles of faith, and the one who rejects that is a kaafir according to scholarly consensus.
Majmoo’ al-Fataawa, 12/497.
Ibn Qudaamah (may Allaah have mercy on him) said:
Whoever believes that something is permissible when there is consensus that it is forbidden and the ruling thereon is well known among the Muslims and the texts leave no room for doubt concerning it – such as pig meat, adultery and the like, concerning which there is no difference of scholarly opinion – is guilty of kufr.
Al-Mughni, 12/276