2 Corinthians 6:11-15

Our mouth has spoken freely to you, O Corinthians, our heart is opened wide. You are not restrained by us, but you are restrained in your own affections. Now in a like exchange—I speak as to children—open wide to us also. Do not be bound together with unbelievers; for what partnership have righteousness and lawlessness, or what fellowship has light with darkness? Or what harmony has Christ with Belial, or what has a believer in common with an unbeliever?