The Book of Occultation — al-Ṭūsī · Hadith 550 (#Ḥadīth #5)
Chapter 42 | Emissaries condemned by the Imam
ومنهم أحمد بن هلال العبرتائي:
And among them Ahmad bin Hilal Abartai:
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).