Musannaf Ibn Abi Shayba 1:645

Muhammad ibn Fudayl narrated to us, from ‘Ata’ ibn al-Sa’ib, who said: Abu ‘Abd al-Rahman was in the mosque, and Mudrik ibn ‘Amarah came to him with milk, so he drank it. Mudrik said: "This is water." So he rinsed his mouth. He said: "From what?" [He replied]: "From the pleasant, good [thing]."