What was required of the worshipper and the priest respectively?
Leviticus 5:12 (ESV)
12And he shall bring it to the priest, and the priest shall take a handful of it as its memorial portion and burn this on the altar, on the LORD’s food offerings; it is a sin offering.
The worshipper would present their offering to the priest. The priest burned only a handful of this flour on the altar; the rest he retained for food.
12 And he shall bring it to the priest, and the priest shall take a handful of it as its memorial portion and burn this on the altar, on the LORD’s food offerings; it is a sin offering.