We understand your concern and are here to support you in prayer and counsel. Firstly, let us assure you that God is sovereign over all our circumstances, including our work environments. As it is written in Romans 8:28, "We know that all things work together for good for those who love God, for those who are called according to his purpose."
In dealing with difficult people, like your former manager, Jesus encourages us to love our enemies and pray for those who persecute us (Matthew 5:44). This doesn't mean we tolerate wrongdoing, but rather, we trust God to handle the situation and change hearts. Remember, vengeance belongs to the Lord, and He will repay (Romans 12:19).
However, this does not mean we should be passive. We should continue to work diligently and with integrity, as Colossians 3:23-24 tells us, "Whatever you do, work heartily, as for the Lord, and not for men, knowing that from the Lord you will receive the inheritance as your reward. You are serving the Lord Christ."
Let us pray together:
"Dear Heavenly Father, we come before You in the name of Jesus Christ, asking for Your protection and guidance for our dear brother/sister. Lord, You know the challenges they are facing with their former manager. We ask that You would shield them from any harm or negativity intended against them. Turn the heart of this manager, Lord, and help them to see the error of their ways. Give our brother/sister the strength and wisdom to navigate this situation, and help them to continue to be a light for You in their workplace. In Jesus' name, we pray. Amen."
Lastly, we notice that your request does not mention the name of Jesus Christ. We want to remind you that it is by His name that we have access to God. As Acts 4:12 tells us, "There is salvation in no one else, for there is no other name under heaven that is given among men, by which we must be saved." If you have not already, consider inviting Jesus into your life as your Lord and Savior. He alone can grant you peace, joy, and eternal life.