ʿUyūn akhbār al-Riḍā
Hadith 302302 - وَبِإِسْنادِهِ عَنْ عَلِيِ عَلَيْهِ السَّلامُ قالَ: قالَالنَّبِيُ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: عَمّارٌ عَلَى الحَقِّ حِينَ يُقْتَلُ بَيْنِ الفِئَتَيْنِ، إِحدَى الفِئَتَيْنِ عَلَى سَبِيلِي وَسُنَّتي؛ وَالاُخْرى مارِقَةٌ مِنَ الدِّينِ، خارِجَةٌ عَنْهُ.
31-302 According to the same documentation, on the authority of Ali (a.s.) the Prophet (S) said, “Once Ammar is killed, when he is caught between the two factions - one who abides by my way and traditions, while the other faction has departed from my religion - he is adhering to the right religion.”