Leaven: Forbidden: To be offered with Meat offerings Which Were Burned
Source: TTT
Leviticus 2:11
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 an offering made by fire to the LORD.
Leviticus 10:12
And Moses said to Aaron and his remaining sons, Eleazar and Ithamar, “Take the grain offering that remains from the offerings made by fire to the LORD and eat it without leaven beside the altar, because it is most holy.