"The Prophet left me while he had a jothous look of contentment and he returned to me grieving. So I asked him about that and he said: 'I entered the Ka'bah, and I wished that I had not done it. I fear that my Ummah will follow me (in that) after me.'"
Reference: Jami` at-Tirmidhi 873 In-book : Book 9, Hadith 66 English translation : Vol. 2, Book 4, Hadith 873
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