The Peak of Eloquence · Hadith 1636 (#Passage #445)
Chapter 78 | In response to Abu Musa Ashari''s letter about the two arbitrators
ومن كتاب له (عليه السلام) إلى أبي موسى الأشعري جوابا في أمر الحكمين، ذكره سعيد بن يحيى الأموي في كتاب المغازي
To Abū Mūsā al-Ash‘arī in reply to his letter regarding the two arbitrators. Sa‘īd ibn Yaḥyā al-Umawī has mentioned this in his “Kitāb al-Maghāzī.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).