al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
فَقَالَ الرَّجُلُ: فَوَاللهِ مَااسْتَطَعْتُ أَنْ أَمْتَنِعَ عِنْدَ قِيَامِ الْحُجَّةِ عَلَيَّ، فَبَايَعْتُهُ عَلَيْهِ الْسَّلاَمُ.
This man related that: By Allāh, by such a clear argument I could not refrain from swearing allegiance to Amīr al-mu’minīn.
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