Shabbat: Kos Pagum

Do not use a kos pagum for kiddush. Kos pagum means either:
  • “Physically damaged or broken drinking utensil":   (You may not use such a cup for kiddush l'chatchila), OR
  • Cup of wine, grape juice, or any beverage that has been drunk from. 
This beverage may not be used for a kos shel bracha until at least a small amount more of some beverage has been added to the existing beverage.