Muhammad ibn Al-Hasan Al-Saffar, from Ahmad ibn Muhammad and Abdullah ibn Muhammad, from Ali ibn Mahziyar, who said: Sulayman ibn Rashid wrote to Imam عليه السلام, informing him that he urinated in the darkness of night and felt a cold drop of urine touch his hand. He was certain that it had touched him, although he did not see it. He wiped it with a cloth and then forgot to wash it. Afterward, he applied oil to his hands, face, and head, performed wudu (ablution) for prayer, and prayed. Imam عليه السلام responded with a reply, which I (Ali Ibn Mahziyar) read in His عليه السلام handwriting: "As for what you suspected may have touched your hand, it is nothing unless you are certain of it. If you are certain of it, then you must repeat the prayers you performed with that same wudu - those that are still within their prescribed time. However, there is no need to repeat those whose time has already passed. This is because if a man’s garment is impure, he does not repeat the prayer except for those performed within their time. But if he was junub (in a state of major ritual impurity) or prayed without wudu, then he must repeat all the obligatory prayers he missed, as the impurity of the garment is different from impurity on the body. Act according to this ruling, if Allah سبحانه وتعالى wills."