For the source text click/tap here: Menachot 102
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When someone donates an animal to the Temple as a sacrifice, it immediately becomes fully sanctified and cannot be redeemed, that is, it cannot be exchanged for money and used for mundane purposes, since it must be brought on the altar. If, however, it developed a blemish that will not allow it to be sacrificed, the Torah permits it to be redeemed, and another animal must be purchased as a replacement (see Vayikra 27:11-12).
The Mishna that opens the twelfth perek of Massekhet Menaḥot deals with questions of redeeming other sanctified items. We learn that meal offerings and libations can be redeemed so long as they were not placed in a keli sharet – a Temple vessel that would give them full sanctity.
Once they were placed in a keli sharet, however, they cannot be redeemed even if they became ritually defiled and cannot be brought as an offering. Similarly, sacrifices brought from fowl, or wood sanctified for use on the altar or frankincense or a keli sharet that became ritually defiled and cannot be brought or used in the Temple, cannot be redeemed.
