Musannaf Ibn Abi Shayba 3:1737

Abu Bakr narrated to us, he said: Hafs bin Ghiyath narrated to us, from al-A’mash, from Abu Dhabyan, from Hudhayfah, who said: He went out on a journey, then he stepped forward and led them in prayer. Then he said: "You shall either seek an Imam other than me, or you shall pray individually."