Leviticus 6:20-22

20‘When Aaron is anointed, Aaron and his sons must give an offering to the Lord. It must be a tenth of an ephah (about two litres) of best flour. They must bring half of it in the morning and half of it in the evening.

21They must mix it with oil and they must cook it on a flat plate. Then they must break it into pieces and they must offer it to the Lord. The smell of it will give the Lord pleasure.

22The son whom they will anoint to take Aaron's place must prepare the offering.