Psalm 109 is a lament of David as he cries out to God against his enemies. In verse 26, David affirms his trust in the Lord, even in the midst of his distress. He acknowledges that it is God who saves and who is his source of strength. Despite the wickedness of his adversaries, David places his hope in the righteous character of God, who will ultimately bring justice and vindication.
Some believe that Christians should pray imprecatory prayers against their enemies and ask the Lord for justice and vindication, while others argue that invoking judgment on their enemies is inappropriate because we have been called to love our enemies and pray for those who mistreat us. Maintaining a biblical balance is important when it comes to 'imprecatory' prayers. While we are called to pray for the forgiveness and salvation of our enemies, justice can also be requested from God. 
It is important to approach this issue with reverence and caution rather than taking it lightly. We must also acknowledge that there might be a moment to implore God to avenge a grievous injustice. However, we should approach such "imprecatory" prayers with divine wisdom, following His direction, and for His ultimate glorification.

Dear Heavenly Father,  I have been wronged by those who hate me without cause. But I know that You are a God of justice and mercy. Help me to trust in You to vindicate me and to repay those who have treated me unfairly. I pray for their hearts to be softened and for them to turn to You in repentance. Help me to forgive them and to love them as You have loved me. May Your will be done in my life for Your glory and honor.
In Jesus's name I pray. Amen.