Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And what communion has light with darkness?
2 Corinthians 6:14
Surrounding context
6:13 Now in return for the same (I speak as to children), you also be open.
6:14 Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And what communion has light with darkness?
6:15 And what accord has Christ with Belial? Or what part has a believer with an unbeliever?