en_tn/lev/20/06.md

so as to prostitute themselves with them

This phrase compares the unfaithful people to prostitutes. Alternate translation: "by doing that, they seek advice from the spirits rather than from me" (See: rc://en/ta/man/translate/figs-metaphor)

I will set my face against that person

This idiom means he "firmly decided." Alternate translation: "I have made up my mind that I will oppose that person" (See: rc://en/ta/man/translate/figs-idiom)

will set my face against

"will stare angrily at"