The Book of Fasting (Kitab Al-Sawm)
Muslim :: Book 6 : Hadith 2629
This badith has been reported on the authority of Yahya b. Abu Kathir with the same chain of transmitters (with a slight variation of these words): I saw the Messenger of Allah (may peace be upon him) after he had completed (the prayer) and there was a trace of clay on his forehead and tip (of the nose).
Source materials are from the University of Southern California MSA site|
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