Parallel
Deuteronomy 13:9
Brenton's English Septuagint · Berean Standard Bible
thou shalt not consent to him, neither shalt thou hearken to him; and thine eye shall not spare him, thou shalt feel no regret for him, neither shalt thou at all protect him:
Instead, you must surely kill him. Your hand must be the first against him to put him to death, and then the hands of all the people.