If you can’t do the time, don’t do the crime.
It is done unto you as you believe.
What goes around, comes around.
Do unto others as you would have them do unto you.
Some of these are reflections of how we should act naturally, while others are phrases describing what happens when you do something that is perceived as bad by society. However you phrase it, it is the the repercussions of an action taken.
The karma itself is the personal heaven or hell you ultimately create for yourself by not being in alignment with your highest purpose.
Each of us has an opportunity to react or respond to the circumstances of the moment.