Sahih Al Bukhari – Book of Drinks
Volumn 007, Book 069, Hadith Number 528.
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Narated By Jabir : Allah's Apostle said, "Extinguish the lamps when you go to bed; close your doors; tie the mouths of your water skins, and cover the food and drinks." I think he added,"… even with a stick you place across the container."
Junaid Tahir