The Difference Between the Sunnah of Custom and the Sunnah of Worship
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Question:
Between two scholars, what is the difference between the Sunnah of custom and the Sunnah of worship? And can the Sunnah of Allah be devotional? So discuss each category with the other, with each other in every type of them, until the situation becomes clear.
Answer:
There is no such thing as a Sunnah of custom. Custom requires a distinction: if it is a permissible custom from among the permissible things, then it is permissible and not a Sunnah, except that it is from the permissible. But if the custom contradicts the Sunnah, then it is forbidden. Customs that contradict the Sunnah of the Messenger of Allah (peace and blessings be upon him) and contradict the Shari'ah are forbidden. So there is no Sunnah of custom as in the question; I do not know of a Sunnah of custom. Yes.
Between two scholars, what is the difference between the Sunnah of custom and the Sunnah of worship? And can the Sunnah of Allah be devotional? So discuss each category with the other, with each other in every type of them, until the situation becomes clear.
Answer:
There is no such thing as a Sunnah of custom. Custom requires a distinction: if it is a permissible custom from among the permissible things, then it is permissible and not a Sunnah, except that it is from the permissible. But if the custom contradicts the Sunnah, then it is forbidden. Customs that contradict the Sunnah of the Messenger of Allah (peace and blessings be upon him) and contradict the Shari'ah are forbidden. So there is no Sunnah of custom as in the question; I do not know of a Sunnah of custom. Yes.
Source
شرح بلوغ المرام من أدلة الأحكام [ صالح الفوزان ]، تابع باب قضاء الحاجة - 3 — islamhouse.com (58:26)
The Arabic text is a machine transcription of the audio recording.