In the Scriptures it tells us to pray for the peace of Jerusalem. Here is Psalm 122 which you can use as your prayer for the peace of God’s people.
Our feet are standing in your gates, O Jerusalem.
Jerusalem is built like a city that is closely compacted together.
That is where the tribes go up, the tribes of the Lord,
to praise the name of the Lord according to the statute given to Israel.
There the thrones of judgment stand, the thrones of the house of David.
Pray for the peace of Jerusalem; “May those who love you be secure.
May there be peace within your wall and security within your citadels.
For the sake of my brothers and friends,
I will say,”Peace be within you.”
For the sake of the house of the Lord our God,
I will seek your prosperity.