Narrated by Muhammad ibn Ali ibn Mahbub, from Muhammad ibn Isa, from al-Hasan ibn Rashid, who said:
The jurist Imam al-Askari عليه السلام said: "There is no (obligatory) rinsing of the mouth (madmadah) or sniffing water into the nose (istinshaq) in ghusl or wudu."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 138