Characteristics of Prayer
Bukhari :: Book 1 :: Volume 12 :: Hadith 772
Narrated Abu Wail:
Hudhaifa said, "I saw a person not performing his bowing and prostrations perfectly. When he completed the prayer, I told him that he had not prayed." I think that Hudhaifa added (i.e. said to the man), "Had you died, you would have died on a tradition other than that of the Prophet Muhammad."
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