Ali ibn al-Hasan ibn Faddal, from Muhammad ibn Abdullah, from Abdullah ibn Sinan, from Abu Abdillah عليه السلام:
Imam عليه السلام said: “It is disliked for the fasting person to immerse himself in water.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 275