Asim bin Damrah narrates regarding Sayyiduna Ali (may Allah be pleased with him): Once, he (by mistake) led the people in prayer while in a state of major ritual impurity (janabah), so Sayyiduna Ali (may Allah be pleased with him) repeated the prayer and instructed the people to repeat the prayer as well. The narrator of this narration is Amr bin Khalid, who is Abu Khalid al-Wasiti (the one who transmitted Musnad Imam Zaid from Imam Zaid), and he is abandoned in hadith; Imam Ahmad bin Hanbal declared him a liar.