Acts 2:42
And they continued stedfast in the teaching of the apostles, and the fellowship, and the breaking of bread, and the prayers.
1 Corinthians 15:33-34
Be not deceived. Evil communications corrupt good manners.
2 Corinthians 6:14-18
Be not unequally yoked with unbelievers; for what fellowship hath righteousness with unrighteousness? or what communion hath light with darkness?
Hebrews 10:24
to provoke one another to love and to good works:
Revelation 18:4
And I heard another voice out of heaven, saying, Come out of her my people, that ye be not partakers of her sins, and that ye receive not of her plagues.