One example is that neither dedications for the altar nor dedications for the repairs of the Temple
may be changed from one holiness to another. Therefore, to offer a burnt-offering in place of a peace-offering, or vice versa would be forbidden. Similarly, if one dedicated something for the repair of the Temple, one must not change this for a dedication for the altar or vice versa. The
rules that even switching a kedushat bedek ha-bayit
contribution from being dedicated to repairing the sanctuary to fixing the altar would be forbidden.
Another example presented by the Mishnah is when the consecrated animals die. In both cases the animal carcass must be buried and cannot be redeemed.
disagrees with this ruling, arguing that in the case of kedushat bedek ha-bayit
the animal can be redeemed even after it has died.
The Gemara explains that the basic problem with redeeming sanctified animals after they have died is that they cannot be redeemed and given as food to the dogs. Even according to the opinion that we may give redeemed blemished dedications to the dogs as food, this only applies when they become trefah, since they can be set before us and appraised (see Vayikra 27:11-12), but not when they are dead. The difference of opinion between the Sages of the Mishnah and Rabbi Shimon is based on the fact that Rabbi Shimon believes that the requirement for the animal to be set before us and appraised only applies to animals that were to be brought on the altar, and not to animals that were consecrated for use by the Temple treasury.