Mishnayos Keilim Perek 8 Mishnah 2

If the hive was complete, and so too in the case of a basket or a skin-bottle, and a sheretz was within it the oven remains clean. If the sheretz was in the oven, any food in the hive remain clean. If a hole was made in it: A vessel that is used for food must have a hole large enough for olives to fall through, If it is used for liquids the hole must be large enough for liquids to pass into it, And if it is used for either it is subjected to the greater restriction: the hole need only be large enough for liquids to pass into it.