Leviticus 27:33
He shall not search whether it be good or bad, neither shall he change it: and if he change it at all, then both it and the change thereof shall be holy; it shall not be redeemed.
Cross-reference
Leviticus 27:10
Parallel
Leviticus 27:10 has the same prohibition against exchanging dedicated animals — a near-identical rule applied to vowed animals.
Ezekiel 48:14
Parallel
Ezekiel 48:14 also forbids selling or exchanging holy things — the same principle applied to the priests' portion of land.