The Peak of Eloquence · Hadith 1241 (#Passage #50)

ومن وصية له (عليه السلام) لعسكره قبل لقاء العدو بصفّين

Given to the army before the encounter with the enemy at Ṣiffīn. [1]

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).