Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Ibn Umar (may Allah be pleased with them both). He says that we passed by a water reservoir along with the Noble Prophet (peace and blessings be upon him). So we began to drink from it by putting our mouths to it, then the Prophet (peace and blessings be upon him) said: "Do not drink by putting your mouth to it." Rather, wash your hands and drink with your hands. For there is no vessel more pure than the hand."