Leviticus 22:2

²Speak thou to Aaron and to his sons, that they beware of these things of the sons of Israel, which things be hallowed, or offered; and that they defoul not the name of the things hallowed to me, which they offer; I am the Lord. (Say thou to Aaron and to his sons, that they must treat with respect those things which the Israelites offer, or dedicate, to me, so that they do not defile my holy name; I am the Lord.)