en_tn/lev/20/16.md

you must kill the woman and the animal. They must certainly be put to death

Both clauses mean the same thing. They emphasize that the woman and animal must die. (See: rc://en/ta/man/translate/figs-parallelism)

They must certainly be put to death

This can be stated in active form. AT: "You must certainly put them to death" (See: rc://en/ta/man/translate/figs-activepassive)