Acts 2:42
and they attended constantly to the teaching and companionship of the apostles, the breaking of bread and the prayers.
1 Corinthians 15:33-34
Be not deceived; evil companionships corrupt good morals.
2 Corinthians 6:14-18
Be not unequally yoked with unbelievers; for what participation has righteousness with wickedness? or what communion has light with darkness?
Hebrews 10:24
and let us observe one another for a provocation of love and of good works,
Revelation 18:4
And I heard another voice from heaven, saying, Come out of her, my people, that you may not partake of her sins, and receive of her plagues;