Gemara:

Sotah 

Collections: Mesechta Sota

References: Sotah: 3A ,  Sotah: 3B  

Description

Explaining what it means when R. Akiva & R. Yishmael argue whether it (kinui, tuma of a cohen for a relative, not releasing an eved) is chova or reshus, and is this a Torah law or not, relates to Tosafos and the Rambam.