Halacha » Kli Rishon

Kli Rishon

A pot which is a kli rishon means a pot that one cooked food in. A kli rishon, as long as the food is still yad soledet bo, has the power to cook in regard to biblical prohibitions, such as cooking on Shabbat or cooking meat and milk together. It does not make a difference if the pot is still on the fire or has been removed from the fire. Therefore, if a kli rishon has permitted food in it and forbidden food falls in, or the other way around, if there isn’t sixty times more permitted food than forbidden food then the food is forbidden to eat because the foods cooked together.

There are, however, two differences between a kli rishon that is still on the fire and a kli rishon that has already been removed from the fire. The first difference is in regard to a kli rishon that previously was yad soledet bo but is no longer that hot. If the food in the kli rishon is still warm, then as long as the pot is on the fire, the food that is in it can halachically cook and transfer taste (Shach, Magen Avraham, and Chochmas Adam. Pri Chadash says it is proper to be stringent). If the pot was removed from the fire then the food in it can cook so long as it is still yad soledet bo, but not once it has cooled and is lower than that.

The second difference is in regards to a ladle. The Maharil writes that a ladle is considered a kli rishon, as opposed to being a kli sheini. The reason is that a ladle gets heated up by being immersed in the kli rishon and thereby gets the status of a kli rishon. The Issur V’heter says we rule stringently like the Maharil. The Shach, Bach, Chochmas Adam, and Aruch Hashulchan all quote the Maharil and rule that a ladle is considered a kli rishon. If a ladle was only used in a kli rishon that was not on the fire, there are some poskim (Chazon Ish, Ohr Letziyon) that are lenient to consider the ladle a kli sheini.