al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
ومن كتاب له (عليه السلام) إلى معاوية جواباً، (قال الشريف:) وهو من محاسن الكتب
In reply to Mu‘āwiyah, and it is one of his most elegant writings
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