Muhammad ibn Al-Hasan Al-Saffar, from Al-Hasan ibn Ali ibn Abdullah, from Abdullah ibn Jabalah, from Saif ibn Amirah, from Maymun, narrated from Abu Abdullah عليه السلام: I said to Imam عليه السلام: "A man becomes junub (in a state of major ritual impurity) at night, performs ghusl (ritual purification), and prays. When morning comes, he notices janabah (impurity) on his garment." Imam عليه السلام said: "Praise be to Allah سبحانه وتعالى, who has established a rule for everything. If, at the time he stood to pray, he did not check (his garment), then he must repeat prayer."