Bukhari :: Book 1 :: Volume 4 :: Hadith 150
Narrated 'Abdullah bin 'Umar:
I went up to the roof of Hafsa's house for some job and I saw Allah's Apostle answering the call of nature facing Sham (Syria, Jordan, Palestine and Lebanon regarded as one country) with his back towards the Qibla. (See Hadith No. 147).
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