The Book of Pilgrimage (Kitab Al-Hajj)
Muslim :: Book 7 : Hadith 2939
Muhammad b. Abu Bakr al-Thaqafi asked Anas b. Malik (Allah be pleased with him), while on their way from Mina to 'Arafa in the morning: What did you do on this day in the company of Allah's Messenger (may peace be upon him)? Thereupon he said: One of us pronounced Tahlil, and he met with no disapproval, and one of us pronounced Takbir, and he also met with no disapproval.
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