Leviticus 27:28 "No taboo thing...shall be redeemed"

Possessions that a person declares Cherem can never be returned to his ownership (see above: Negative Mitzvah 110).

They are transferred to the priest or the Temple treasury, depending on the type of Cherem.

The person who dedicated them is forbidden to redeem them in the future.

(It should be noted that Negative Mitzvot 110-111 refer to an object that was designated as Cherem without any defined purpose.

One may devote objects specifically to the Beit HaMikdash and these objects are redeemable.)