Premanand Maharaj Ji
How can I end hatred between me and another person through prayer?
Stay humble and pray inside
Pray inwardly to your Ishta Dev (your chosen form of God) for strength to bear the hatred, and stay humble without hating back. God will take care of the other person, and your heart stays cool.
If you want to end the play of hatred, you must stay humble from your side. You must not hate. Even if they are hostile to you, you must not be hostile back.