Leviticus 2:1-2

1A person may want to give grain as a gift to the Lord. He must make it into flour. He must put oil and incense on the flour.

2He must take it to Aaron's sons, the priests. The priest will take some of the flour and oil and all the incense in his hand. He will burn them on the altar as a gift to the Lord. The smell of them while they are burning will give the Lord pleasure.