NUM 5:15

15 he should take his wife to the priest. He must take along as an offering two quarts/liters of barley flour. The priest must not pour [olive] oil or incense on it, because this is an offering that the man has brought because he ◄is jealous/wants his wife to sleep only with him►. It is an offering to find out if she is guilty or not. [Neither olive oil nor incense should be used because are associated with joy and this is not a time for joy.]