The Peak of Eloquence · Hadith 1182 (#Passage #1)
Chapter 238 | The two arbitrators after the Battle of Siffin
ومن خطبة له (عليه السلام) في شأن الحكمين وذمّ أهل الشام
About the two arbitrators (Abū Mūsā al-Ash‘arī and ‘Amr ibn al-‘Āṣ) and disparagement of the people of Syria (ash-Shām)
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).