Leviticus 2:5

2:5 If your offering is a grain offering made on the griddle, it must be choice wheat flour mixed with olive oil, unleavened.

Leviticus 2:11

Additional Grain Offering Regulations

2:11 “‘No grain offering which you present to the Lord can be made with yeast, for you must not offer up in smoke any yeast or honey as a gift to the Lord.