And from him, from Hammad, from Hariz, from Abu Abdillah عليه السلام, peace be upon him, who said:
Imam عليه السلام said: “The fasting person and the person in the state of ihram must not submerge his head in water.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 268