Leviticus 2:1-2

¹When you bring a grain offering to the Lord, your offering be of the best flour. Pour olive oil on it and put frankincense on it,

²and take it to Aaron's sons the priests. The priest shall take a handful of the flour and olive oil mixture, as well as all the frankincense, and burn this as a ‘reminder part’ on the altar, a food offering, to be accepted by the Lord.