Musannaf Ibn Abi Shayba 15:260

Abu Bakr narrated to us, he said: Abdullah ibn Idris narrated to us, from Yazid, from Abd al-Rahman ibn Abi Layla and Abu Juhayfah, they both said: Ali used to provide us with *al-tila* (boiled grape juice). He said: I said, "How was it?" He said: "We used to eat it with bread and mix it with water."