The Book of Faith (Kitab Al-Iman)
Muslim :: Book 1 : Hadith 407
This hadith was narrated by A'mash on the authority of the same chain of narrators and he said: One day the Messenger of Allah (may peace be upon him) climbed the hill of Safa' and said: Be on your guard, and the rest of the hadith was narrated like the hadith transmitted by Usama; he made no mention of the revelation of the verse:" Warn thy nearest kindred."
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