"Again, you have heard what was said to your people long ago. They were told, 'Do not break the promises you make to the Lord. Keep the oaths you have made to him.'
References for Matthew 5:33
But here is what I tell you. Do not make any promises like that at all. Do not make them in the name of heaven. That is God's throne.
Do not make them in the name of the earth. That is the stool for God's feet. Do not make them in the name of Jerusalem. That is the city of the Great King.
And do not take an oath in the name of your head. You can't make even one hair white or black.
"Just let your 'Yes' mean 'Yes.' Let your 'No' mean 'No.' Anything more than this comes from the evil one.