Sahih Muslim Book - 2, Hadith - 611

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ بْنِ قَعْنَبٍ حَدَّثَنَا سُلَيْمَانُ يَعْنِي ابْنَ بِلَالٍ عَنْ يَحْيَى بْنِ سَعِيدٍ عَنْ مُحَمَّدِ بْنِ يَحْيَى عَنْ عَمِّهِ وَاسِعِ بْنِ حَبَّانَ قَالَ كُنْتُ أُصَلِّي فِي الْمَسْجِدِ وَعَبْدُ اللَّهِ بْنُ عُمَرَ مُسْنِدٌ ظَهْرَهُ إِلَى الْقِبْلَةِ فَلَمَّا قَضَيْتُ صَلَاتِي انْصَرَفْتُ إِلَيْهِ مِنْ شِقِّي فَقَالَ عَبْدُ اللَّهِ يَقُولُ نَاسٌ إِذَا قَعَدْتَ لِلْحَاجَةِ تَكُونُ لَكَ فَلَا تَقْعُدْ مُسْتَقْبِلَ الْقِبْلَةِ وَلَا بَيْتِ الْمَقْدِسِ قَالَ عَبْدُ اللَّهِ وَلَقَدْ رَقِيتُ عَلَى ظَهْرِ بَيْتٍ فَرَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَاعِدًا عَلَى لَبِنَتَيْنِ مُسْتَقْبِلًا بَيْتَ الْمَقْدِسِ لِحَاجَتِهِ.

It was narrated from Muhammad bin Yahya that his paternal uncle Wasi' bin Habban said: "I was praying in the Masjid and 'Abdullah bin 'Umar was leaning with his back towards the Qiblah. When I had finished my prayer, I came to him from one side and 'Abdullah said: 'The people are saying that when you sit to relieve yourself, do not sit facing towards the Qiblah nor towards Bait Al-Maqdis (Jerusalem).' 'Abdullah said: 'I went up on the roof of a house and I saw the Messenger of Allah (s.a.w) sitting on two bricks, facing towards Jerusalem, relieving himself."'