The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 270 (#Ḥadīth #270)

270 - وَبِإِسْنادِهِ عَنْ عَلِيِ a.sُ قالَ: قالَالنَّبِيُ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: تَقتُلُ عَماراً الفِئَةُ الباغِيَةُ.

31-270 According to the same documentation on the authority of Ali , the Prophet (S) said, “A rebellious group will kill Ammar.”

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