Abu Dawud
Drinks
Book Number: 020 / Hadith Number: 3686
Narated By Qays ibn an-Nu'man : The Prophet (pbuh) said: Do not drink from hollowed stumps, vessel smeared with pitch, pumpkins, and green jars, but drink from a skin which is tied with string. If the drink ferments, lighten it by infusing water. If you are helpless, then pour it away.