Jamieson, Fausset and Brown on Leviticus 22:23

23. that mayest thou offer, &c.--The passage should be rendered thus: "if thou offer it either for a freewill offering, or for a vow, it shall not be accepted." This sacrifice being required to be "without blemish" [Le 22:19], symbolically implied that the people of God were to dedicate themselves wholly with sincere purposes of heart, and its being required to be "perfect to be accepted" [Le 22:21], led them typically to Him without whom no sacrifice could be offered acceptable to God.