Abu Karimah (may Allah have mercy on him) relates: I heard Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) delivering a sermon on the pulpit of Kufah, saying: "O people, I heard the Messenger of Allah (peace and blessings be upon him) say: 'Beware of the clothing of the monks, for whoever adopts monasticism and imitates them is not of me.'"
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Sayyiduna Ali (may Allah be pleased with him) except with this chain; Muhammad bin Salih bin Mihran is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 3909
Hadith Gradingمحدثین:إسناده لا بأس به
Hadith Takhrij«قال ابن حجر: سند لا بأس به «فتح الباري شرح صحيح البخاري، ج 10، ص 284»» «قال الهيثمي: وفيه علي بن سعيد الرازي وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 5، ص 131»»