The Peak of Eloquence · Hadith 1284 (#Passage #93)

ومن وصية له (عليه السلام) كان يكتبها لمن يستعمله على الصدقات

Amīr al-mu’minīn used to write to whoever he appointed for the the collection of zakāt and charities.

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