Narrated to me by the Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, who said: Ahmad bin Muhammad bin Al-Hasan narrated to me, from his father, from Muhammad bin Yahya and Ahmad bin Idris, from Muhammad bin Ahmad bin Yahya, from Ya'qub bin Yazid, from Abdul Hamid bin Abi Al-'Ala or someone else (through an elevated chain), who said: Al-Hasan bin Ali عليه السلام was asked: 'What are the limits for relieving oneself?' Imam عليه السلام said: 'Do not face the Qiblah, do not turn your back to it, do not face the wind, and do not turn your back to it.'