The Pashtun code of revenge against the wrongdoers became a proverb in India

The Pashtun code of revenge against the wrongdoers became a proverb in India. 

John Briggs in 1829 writes: "Afghan revenge has become proverbial in India . It is said , a man is never safe from the revenge of an elephant , a nag ( the cobra snake), or an Afghan".

So the following famous saying in the Rambo III movie is not some original or creative writing by a Hollywood writer. It is indeed based on an old proverb from India.