Matthew 7:13-14
"You should enter [God's kingdom] by means of the narrow door, for the wide door and the broad road are the ones that lead to [spiritual and physical] destruction. And many people will enter [that wide door].
Luke 13:24
"You should try hard to enter [God's kingdom] by means of the narrow door, for I tell you, many people will try to enter it but will not be able to.
Acts 2:40
So, Peter testified and urged the crowd with many additional words, saying, "Save yourselves from [the condemnation coming on] this sinful generation [by responding to this message]."
2 Corinthians 6:17
Therefore, the Lord says [Isa. 52:11], "You people should leave their company [i.e., unbelievers, verse 14] and separate yourselves from them, and do not touch anything unclean [i.e., their evil practices], and I will welcome you."
Revelation 18:4
Then I heard another voice from heaven, saying, "Come out of her, my people, so that you do not share in her sins, and so that you do not receive her plagues [i.e., judgments].