When one is obligated to swear about something, we can have him swear about something else that if it stod on its own, he would not be obligated to swear. What is the derivation of this law and in what cases does it apply? Items acquired through bartering are discussed – kinyan chalipin. Can this be done with money? Produce? Or only keilim, vessels? Items acquired by the temple treasury have different laws than regular items. Regular items can only be acquired through pulling while temple items are acquired with money. Designating something with words for the treasury is as if it was pulled.