Leviticus 2:1-2

‘When anyone presents a grain offering to the Lord, his offering shall be of fine flour, and he shall pour [olive] oil over it and put frankincense on it. He shall bring it to Aaron’s sons the priests. Out of it he shall take a handful of the fine flour and oil, with all of its frankincense, and the priest shall offer this up in smoke on the altar [of burnt offering] as the memorial portion of it. It is an offering by fire, a sweet and soothing aroma to the LORD.