Leviticus 27:32-34

³²'And all the tithe of the herd and of the flock — all that passeth by under the rod — the tenth is holy to Jehovah;

³³he enquireth not between good and bad, nor doth he change it; and if he really change it — then it hath been — it and its exchange is holy; it is not redeemed.'

³⁴These are the commands which Jehovah hath commanded Moses for the sons of Israel, in mount Sinai.