A family or social practice may be common for many years, but being common by itself does not make it a Shari'ah ruling.
Its Shari'ah status must be understood through reliable scholarship.
So 'we have always done it this way' is not, by itself, enough to prove a Shari'ah ruling.
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Custom Is Not Automatically a Shari'ah Ruling
Why Fiqh Is Needed and Its Broad Range
A family or social practice may be common for many years, but being common by itself does not make it a Shari'ah ruling.
Its Shari'ah status must be understood through reliable scholarship.
So 'we have always done it this way' is not, by itself, enough to prove a Shari'ah ruling.