The Peak of Eloquence · Hadith 1469 (#Passage #278)

ومن عهد له (عليه السلام) كتبه للأشتر النخعي لما ولاه على مصر وأعمالها حين اضطرب أمر أميرها محمد بن أبي بكر، وهو أطول عهد كتبه وأجمع للمحاسن

Instructions [1] written for (Mālik) al-Ashtar an-Nakha‘ī, when the position of Muḥammad ibn Abī Bakr had become precarious, and Amīr al-mu’minīn had appointed al-Ashtar as the Governor of Egypt and the surrounding areas; it is the longest document and contains the greatest number of beautiful sayings.

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