Gemara:

Pesachim 

References: Pesachim: 7a ,  Pesachim: 21b  

Description

This chaburah analyzed the three basic approaches from the Rishonim how to explain the gemorah of Hamikadesh bichometz dirabanan ein hosheshin likidushav. It specifically addressed shitas rashi who uses hefker beis din hefker and kol dimikadesh al das dirobonon mikadesh.