al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
١٨٣. وَقَالَ (عليه السلام): مَا اخْتَلَفَتْ دَعْوَتَانِ إِلَّا كَانَتْ إِحْدَاهُمَا ضَلاَلَةً.
183. Amīr al-mu’minīn, peace be upon him, said: If there are two different calls then one (of them) must be towards misguidance.
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