"For where two or three gather in my name, there am I with them.”

Matthew 18:20

And let us consider one another to provoke unto love and to good works: Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching.

Hebrews 10:24-25

Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness?

2 Corinthians 6:14