1 Corinthians 6:3

Dare any of you, having a matter against his neighbor, go to law before the unrighteous, and not before the saints?

Don’t you know that the saints will judge the world? And if the world is judged by you, are you unworthy to judge the smallest matters?

If then you have to judge things pertaining to this life, do you set them to judge who are of no account in the assembly?

I say this to move you to shame. Isn’t there even one wise man among you who would be able to decide between his brothers?

But brother goes to law with brother, and that before unbelievers!