Abdullah b. Shaqiq reported that 'Uthman (Allah be pleased with him) used to forbid Tamattu', whereas 'Ali (Allah be pleased with him) ordered to do it. 'Uthman said a word to 'Ali, but 'Ali said:
You know that we used to perform Tamattu' with the Messenger of Allah (ﷺ), whereupon he said: It is right, but we entertained fear.
Reference: Sahih Muslim 1223 a In-book : Book 15, Hadith 171 USC-MSA web (English) : Book 7, Hadith 2815 (deprecated)
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