Leviticus 2:1-2, 4-5, 15-16

‘Now when anyone presents a grain offering as an offering to the LORD, 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 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 the LORD.

‘Now when you bring an offering of a grain offering baked in an oven, it shall be unleavened cakes of fine flour mixed with oil, or unleavened wafers spread with oil. If your offering is a grain offering made on the griddle, it shall be of fine flour, unleavened, mixed with oil

You shall then put oil on it and lay incense on it; it is a grain offering. The priest shall offer up in smoke its memorial portion, part of its grits and its oil with all its incense as an offering by fire to the LORD.