The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 248 (#Ḥadīth #248)

248 - وَبِإِسْنادِهِ عَنْ عَلِيِ a.sُ، عَنِ النَّبِيصَلَّى اللهُ عَلَيْهِ وَآلِهِ قالَ: الإِثنانِ وَما فَوقَهُما جَماعَةٌ.

31-248 According to the same documentation, on the authority of Ali , the Prophet (S) said, “Two or more make up a congregational prayer.”

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