Matthew 12:45
Then it goes and takes with it seven other spirits, more evil than itself, and they reenter [the body] and [begin to] live there, so that the latter state of that person becomes worse than the former [state]. It will be the same way with the people of this evil generation."
John 6:66
Upon [hearing] this, many of Jesus' disciples turned back and refused to accompany Him anymore. [Note: They deserted Jesus physically as well as spiritually].
Romans 12:9
Let [your] love be sincere. Hate whatever is evil. Cling to whatever is good.
2 Corinthians 6:14-17
Do not team up with unbelievers [i.e., in close relationships, such as marriage, etc.]. For what do righteousness and wickedness have in common? Or, what fellowship can light have with darkness?
Hebrews 10:38-39
And my [i.e., God's] righteous person will [obtain] life by [his] faith [in God]. But if he turns back [from me], my soul is not pleased with him."
2 Peter 2:18-22
[Although] their talk is big, what they say is worthless, and by [offering people] fleshly desires [i.e., sexual gratification], they lead people astray, who are barely escaping from the error of the world.
1 John 2:9
The person who claims to be living in [harmony with] the light [i.e., by obeying God's truth], and [yet] hates his brother is still [living] in the darkness [of sin].