Leviticus 7:10-12

10and every grain offering, whether mixed with olive oil or dry, belongs equally to all the sons of Aaron.

11“ ‘These are the regulations for the fellowship offering anyone may present to the Lord:

12“ ‘If they offer it as an expression of thankfulness, then along with this thank offering they are to offer thick loaves made without yeast and with olive oil mixed in, thin loaves made without yeast and brushed with oil, and thick loaves of the finest flour well-kneaded and with oil mixed in.