The Peak of Eloquence · Hadith 1592 (#Passage #401)

ومن كتاب له (عليه السلام) إلى قثم بن العباس وهو عامله على مكة

To Qutham ibn al-‘Abbās, his Governor of Mecca

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