al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
وَقَدْ قُلْتُمْ «رَبُّنَا اللهُ»، فَاسْتَقِيمُوا عَلَى كِتَابِهِ، وَعَلَى مِنْهَاجِ أَمْرِهِ، وَعَلَى الطَّرِيقَةِ الصَّالِحَةِ مِنْ عِبَادتِهِ، ثُمَّ لاَ تَمْرُقُوا مِنْهَا، وَلاَ تَبْتَدِعُوا فِيهَا، وَلاَ تُخَالِفُوا عَنْهَا; فَإنَّ أَهْلَ الْمُرُوقِ مُنْقَطَعٌ بِهمْ عِنْدَ اللهِ يَوْمَ الْقِيَامَةِ.
You have said, ‘“Our Lord is Allāh.” Then keep steadfast to His Book, to the way of His command and to the virtuous course of His worship. Thereafter do not go out of it, do not introduce innovations in it, and do not turn away from it, because those who go away from this course will be cut off from (the mercy of) Allāh on the Day of Judgement.
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