Verb (dictionary form) + べからず

[Must not; do not (prohibition)]

Connection: Verb (dictionary form) + べからず (する → するべからず / すべからず)

Usage: A classical Japanese prohibition form meaning "must not" or "do not." Commonly seen on signs, notices, rules, and proverbs. Very formal and authoritative. Not used in everyday conversation.

Common examples on signs:

• 立ち入るべからず (Do not enter)
• 触るべからず (Do not touch)
• 忘るべからず (Must not forget)

Examples:

芝生に入るべからず。(Do not enter the lawn.)

初心忘るべからず。(One must not forget the beginner's spirit. — famous proverb)

ここにゴミを捨てるべからず。(Do not dump garbage here.)