Matthew 5:9, 33-37

God blesses those who work for peace, for they will be called the children of God.

“You have also heard that our ancestors were told, ‘You must not break your vows; you must carry out the vows you make to the LORD.’ But I say, do not make any vows! Do not say, ‘By heaven!’ because heaven is God’s throne. And do not say, ‘By the earth!’ because the earth is his footstool. And do not say, ‘By Jerusalem!’ for Jerusalem is the city of the great King. Do not even say, ‘By my head!’ for you can’t turn one hair white or black. Just say a simple, ‘Yes, I will,’ or ‘No, I won’t.’ Anything beyond this is from the evil one.