Numbers 15:8-9

15:8 And when you prepare a young bull as a burnt offering or a sacrifice for discharging a vow or as a peace offering to the Lord, 15:9 then a grain offering of three-tenths of an ephah of finely ground flour mixed with half a hin of olive oil must be presented with the young bull,

Leviticus 2:1

Grain Offering Regulations: Offering of Raw Flour

2:1 “‘When a person presents a grain offering to the Lord, his offering must consist of choice wheat flour, and he must pour olive oil on it and put frankincense on it.