The Peak of Eloquence · Hadith 1557 (#Passage #366)

ومن كتاب له (عليه السلام) إلى الأسود بن قطيبة صاحب جند حلوان

To al-Aswad ibn Quṭbah, the Governor of Ḥulwān

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