Leviticus 6:15

‘Now when anyone brings near a grain offering as an offering to Yahweh, his offering shall be of fine flour, and he shall pour oil on it and put frankincense on it.

‘He shall then bring it to Aaron’s sons the priests; and he shall take from it his handful of its fine flour and of its oil with all of its frankincense. And the priest shall offer it up in smoke as its memorial portion on the altar, an offering by fire of a soothing aroma to Yahweh.

Then Moses spoke to Aaron and to his remaining sons, Eleazar and Ithamar, “Take the remaining grain offering from the offerings to Yahweh by fire and eat it unleavened beside the altar, for it is most holy.