Sa'id bin 'Abdur Rahman bin Hasaan سعيد بن عبد الرحمن بن حسان · The Book on Purification

Allah's Messenger said: "When one of you arrives to defecate, then let none of you face the Qiblah while defecating, nor while urinating. And do not have your back towards it, but have it east of you or west of you."

"A Bedouin entered the Masjid while the Prophet was sitting. He prayed, then when he was finished, he said: 'O Allah! Have mercy upon me and Muhammad, and do not have mercy on anyone along with us.' The Prophet turned, towards him and said: 'You have restricted something that is unrestricted.' It was not long before he was urinating in the Masjid. So the people rushed to him. But Prophet said: 'Pour a bucket of water over it - or…