what goes around comes around
informal
*—used to say that if someone treats other people badly he or she will eventually be treated badly by someone else
You should not mistreat them. What goes around comes around.
© 2020 Merriam-Webster, Incorporated
"Do unto others as you would have them do unto you."
*Treat other people with the concern and kindness you would like them to show toward you. This saying has come to be called the Golden Rule.
© 2020 Dictionary.com, LLC