Sahih Bukhari Volume 008, Book 073, Hadith Number 103.

Narated By Anas bin Malik : Allah's Apostle visited a household among the Ansars, and he took a meal with them. When he intended to leave, he asked for a place in that house for him, to pray so a mat sprinkled with water was put and he offered prayer over it, and invoked for Allah's Blessing upon them (his hosts).

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