Leaven (Yeast): Leavened Bread Forbidden with Meat offerings

No grain offering that you present to the LORD may be made with leaven, for you are not to burn any leaven or honey as a food offering to the LORD.

It must not be baked with leaven; I have assigned it as their portion of My food offerings. It is most holy, like the sin offering and the guilt offering.

And Moses said to Aaron and his remaining sons, Eleazar and Ithamar, “Take the grain offering that remains from the food offerings to the LORD and eat it without leaven beside the altar, because it is most holy.

You must not offer the blood of My sacrifices with anything leavened, nor may the fat of My feast remain until morning.

Do not offer the blood of a sacrifice to Me along with anything leavened, and do not let any of the sacrifice from the Passover Feast remain until morning.