Answer:
"To everyone his due" is a saying that means that each person should get what they deserve.
Step-by-step explanation:
The meaning of the expression "to everyone his due" is that you will get what you deserve - if you do good, good things will come to you; if you do bad, you will get bad things in return. In other words, your fate is defined by your deeds. If you are a good person, life will reward you. If you take the wrong path, life will do you wrong as well.
It is believed that the origin of this phrase comes from Greek or Roman writers, but there is no certainty who coined it - it might as well have been Aristotle, Plato or Cicero.