question #1 Sahih Muslim 262a, Book 2, Hadith 73 : What are the etiquettes and prohibitions related to relieving oneself in Islam?

Your Apostle (ﷺ) teaches you about everything, even about excrement. He replied: Yes, he has forbidden us to face the Qibla at the time of excretion or urination, or cleansing with right hand or with less than three pebbles, or with dung or bone.