You reap what you sow...

"Then Harbona, one of the king’s aides, said, “Sir, Haman has just ordered a 75-foot gallows constructed, to hang Mordecai, the man who saved the king from assassination! It stands in Haman’s courtyard.”
“Hang Haman on it,” the king ordered.
So they did, and the king’s wrath was pacified." Esther 7:9 - 10

The 'You Version' notes comments on this nicely:
"Revenge is a plot that plays out in movies or TV shows, but not reality. The same with making strategies to harm people. While we may not plan physical harm to others, often we do it with our words. We harm reputations. We spread gossip. We plant seeds of doubt in people's minds. But over time, we become known as someone who cannot be trusted, whose advice is not worth listening to. Our own reputations are damaged, and we become trapped by our own devices."

Proverbs 26:27 in The Message says: "Malice backfires; spite boomerangs" and in the Living Bible it is: "The man who sets a trap for others will get caught in it himself. Roll a boulder down on someone, and it will roll back and crush you."