Zevachim 71: Intermingled Offerings

We learn a new Mishna:

• all of the offerings intermingled with animals from whom we cannot derive benefit is forbidden
• this includes sin offerings left to die, an ox sentenced to be stoned, even if the ratio is one in 10,000, deriving benefit is prohibited and they all must die
• all offerings intermingling with animals whose sacrifice is forbidden but deriving benefit is not, these are not forbidden
• these include an ox who has been part of a transgression, an ox known to have killed someone based on the testimony of one witness or the admission of the owner, animals involved in sexual acts or idol worship, animals used as payment to a prostitute or the price of a dog
• offerings intermingled with an animal born of a mixture of diverse kinds
• this includes the offspring of a ram and a goal, or an animal with a wound that will cause it to die within twelve months, or an animal born by cesarean section
• all of those animals are left to graze until they become unfit for sacrifice at which point they are sold
• The money from that sale is used to buy another similar but kosher offering
• If sacrificial animals were intermingled with other sacrificial animals of the same type of offering, each owner fulfils his obligation by sacrificing his animal for its own sake
• if sacrificial animals were intermingled with other sacrificial animals of different types of offings (two rams, one as a burnt offering and one as a peace offering), they graze until they become unfit, they are sold, and then that money is used to pay for another offering of the same type
• When sacrificial animals are intermingled with a firstborn offering or an animal tithe offering, they shall graze until they become unfit and then they are both eaten as a firstborn offering or as an animal tithe offering
• all offerings can become indistinguishably intermingled with each other except for a sin offering and a guilt offering

The Gemara wonders why this Mishna is necessary.  We have already learned this halacha regarding sacrificial animals, regardless to the ratio.  The rabbis consider a number of explanations for the seemingly repetitive Mishna.