al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
[منها في ذمّ البدعة :] وَمَا أُحْدِثَتْ بِدْعَةٌ إِلاَّ تُرِكَ بِهَا سُنَّةٌ، فَاتَّقُوا الْبِدَعَ، والْزَمُوا الْمَهْيَعَ، إِنَّ عَوَازِمَ الاْمُورِ أَفْضَلُهَا، وَإِنَّ مُحْدِثَاتِهَا شِرَارُهَا.
[A part of the same sermon on innovation (bid‘ah) :] No innovation is introduced unless one sunnah is forsaken, keep away from innovations and stick to the broad road. Surely the old tested ways are the best and the innovated ones are bad.
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