al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
ومن كتاب له (عليه السلام) إلى أبي موسى الأشعري وهو عامله على الكوفة، وقد بلغه عنه تثبيطه الناس عن الخروج إليه لما ندبهم لحرب أصحاب الجمل
To Abū Mūsā (‘Abdullāh ibn Qays) al-Ash‘arī, the Governor of Kūfah when Amīr al-mu’minīn learned that he was dissuading the people of Kūfah from joining in the battle of Jamal when Amīr al-mu’minīn had called them to fight along with him.
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