Hadith 1779
۞
183. Amīr al-mu’minīn, peace be upon him, said: If there are two different calls then one (of them) must be towards misguidance.
١٨٣. وَقَالَ (عليه السلام): مَا اخْتَلَفَتْ دَعْوَتَانِ إِلَّا كَانَتْ إِحْدَاهُمَا ضَلاَلَةً.