What was Prophet Muhammad (saw) doing when `Abdullah bin `Umar saw him from the roof of his house?
 Narrated `Abdullah bin `Umar:                     People say, "Whenever you sit for answering the call of nature, you should not face the Qibla or Baitul-Maqdis (Jerusalem)." I told them. "Once I went up the roof of our house and I saw Allah's Apostle answering the call of nature while sitting on two bricks facing Baitul-Maqdis (Jerusalem) (but there was a screen covering him. ' (Fath-al-Bari, Page 258, Vol. 1).