Musannaf Ibn Abi Shayba 3:6424

Abu Bakr narrated to us, he said: Mu'adh narrated to us, from Ash'ath, from al-Hasan, that he said regarding the intoxicated person leading the people in prayer: "If he completes the bowing and prostration for them, then it is sufficient for him and for them." And Muhammad said: "They all repeat, including the Imam."