If you are thinking of being vengeful with anyone, you are stealing from God. That is a key part of why we must never give in to the desire for vengeance. It is also God's to give mercy, though He freely allows us (and even demands for us) to join Him in that mercy. Thus sometimes He will give grace to those who do wrong to you, as is His right. But that is because it is His to give vengeance and if He chooses not to exercise that right, well that is His right. But if you choose to exercise vengeance, then you are not doing something you have the right to do! You are stealing from God.
So when someone does you wrong, forgive. Be kind. As the very next verse says:
Don't steal from the Lord, but repay evil with good, for that is the way of the kingdom.