(idiomatic) Alternative form of speak of the devil

People are similar in character to their friends.

People who behave wickedly receive their just deserts.

Alternative form of he who laughs last laughs best

Success is enjoyed more after having previously endured ridicule.

Alternative form of who pays the piper calls the tune

(colloquial) A person who uses a rhyming proverb, such as he who smelt it dealt it, in response to a flatus, is likely the one who expelled it.

Someone that plans harm or misfortune for others may also inadvertently be the recipient of that same misfortune.

One must be careful when dealing with bad people.

Alternative form of let him who is without sin cast the first stone