Leviticus 2:10-11

What is left of the grain offering belongs to Aaron and his sons; it is a most holy part of the offerings to the LORD by fire. ‘No grain offering that you bring to the LORD shall be made with leaven, for you shall not offer up in smoke any leaven [which symbolizes the spread of sin] or any honey [which, like leaven, is subject to fermentation] in any offering by fire to the LORD. [1 Cor 5:8]