Zevachim 112 - January 4, 15 Tevet

The Gemara explains that the Mishna follows Rabbi Nechemia's opinion regarding the status of the remainder of the blood. Why did the Mishna compare the case of two cups of blood to a sin offering that was lost and replaced with another? The Gemara explains that this comparison was introduced in order to teach the law regarding a case that can be derived from the Mishna. It clarifies the distinction between an animal designated to replace a lost offering and a situation in which a person designates two animals from the outset so that one will serve as a backup. The Mishna presents numerous cases in which the laws of offering sacrifices outside the Temple do not apply - either because of the type of offering (one that is not brought inside the Temple) or because of the animal itself (a disqualified animal), or because the item is not meant to be offered at all (such as edible portion of a sacrifice). Rabbi Shimon disagrees with the rabbis in three cases where the item will eventually be permitted to be placed on the altar.  The Mishna also provides a historical overview: When were sacrifices permitted to be offered outside the Temple (on bamot), and when were they prohibited? What were the laws governing each period - both when bamot were allowed and when they were forbidden? And during the time when bamot were permitted, which sacrifices could be offered anywhere?