べからず vs べからざる — one's a sign, the other's an adjective

Quick note for anyone confusing these two: 「立入るべからず」on a sign is the terminal form べからず, used almost exclusively for prohibitions/notices ('shall not enter'). べからざる is the attributive form, so it sits directly before a noun: 「許すべからざる行為」= 'an unforgivable act'. You basically never see べからざる on its own at the end of a sentence.