Abu al-Laith Samarqandi wrote in his book Admonition for the Neglectful on page 126 (paraphrase of)
Ghiibah can be divided into four categories:
Kufr
Nifaaq
Disobedience
Permissible
As for the case where it is kufr then it is (as in the following example) that a Muslim does ghiibah and it is said to him do not do ghiibah. Thereupon he says: This is not ghiibah and I am truthful in regards to that. He has made halaal what Allaah has made haraam. He who makes halaal what Allaah has made haraam (on purpose and knowing so) becomes a kaafir.
Ghiibah can be divided into four categories:
Kufr
Nifaaq
Disobedience
Permissible
As for the case where it is kufr then it is (as in the following example) that a Muslim does ghiibah and it is said to him do not do ghiibah. Thereupon he says: This is not ghiibah and I am truthful in regards to that. He has made halaal what Allaah has made haraam. He who makes halaal what Allaah has made haraam (on purpose and knowing so) becomes a kaafir.
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