Leviticus 13:36; Leviticus 27:33

Leviticus 13:36

36 then the priest shall look at him, and if the scale has spread in the skin, the priest need not seek for the yellowish hair; he is unclean.

Leviticus 27:33

33 'He is not to be concerned whether it is good or bad, nor shall he exchange it; or if he does exchange it, then both it and its substitute shall become holy. It shall not be redeemed.' "