Leviticus 2:1-2

1“When anyone brings a sacrifice offering of grain to Adonai, his offering shall be of fine flour, and he is to pour oil on it and put frankincense on it.

2He is to bring it to Aaron’s sons, the kohanim, and he should take from there his handful of its fine flour, and of its oil, with all its frankincense. Then the kohen should burn up as smoke its memorial portion on the altar, an offering made by fire—a soothing aroma to Adonai.