al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
أَمَّا بَعْدُ، فَقَدْ بَلَغَنِي أَنَّ رِجَالًا مِمَّنْ قِبَلَكَ يَتَسَلَّلُونَ إِلَى مُعَاوِيَةَ، فَلَا تَأْسَفْ عَلَى مَا يَفُوتُكَ مِنْ عَدَدِهِمْ، وَيَذْهَبُ عَنْكَ مِنْ مَدَدِهِمْ، فَكَفَى لَهُمْ غَيّاً، وَلَكَ مِنْهُمْ شَافِياً، فِرَارُهُمْ مِنَ الْهُدَى والْحَقِّ، وَإِيضَاعُهُمْ إِلَى الْعَمَى وَالْجَهْلِ.
Now, I have come to know that certain persons from your side are stealthily going over to Mu‘āwiyah. Do not feel sorry for their numbers so lost to you or for their help of which you are deprived. It is enough that they have gone into misguidance and you have been relieved of them. They are running away from guidance and truth and advancing towards blindness and ignorance.
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