The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, informed me from Ahmad ibn Muhammad, from his father, from al-Husayn ibn al-Hasan ibn Aban, from al-Husayn ibn Saʿid, from al-Qasim ibn ʿUrwah, from Abdullah ibn Sinan, from Abu Abdullah عليه السلام, who said: Imam عليه السلام said: "Rinsing the mouth (Madmada) and sniffing water into the nose (Istinshaq) are among the practices established by the Messenger of Allah سبحانه وتعالى (peace and blessings be upon him and his family)."