Narrated to me by the Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, who said: Ahmad bin Muhammad bin Al-Hasan bin Al-Walid narrated to me, from his father, from Muhammad bin Yahya Al-Attar and Ahmad bin Idris, both of them, from Muhammad bin Ahmad bin Yahya, from Ya'qub bin Yazid, from Ibn Abi Umayr, 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 of 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.'