Ahmad ibn Muhammad, from Ali ibn al-Hakam, from al-Husayn ibn Abi al-‘Ala reported:
I asked Abu ‘Abdillah عليه السلام about urine that touches the body. Imam عليه السلام said: "Pour water over it twice."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 285