Matthew 7:13-14
"Enter ye in through the narrow gate; because wide is the gate, and broad is the way that leads to destruction, and many are those who enter through it;
Luke 13:24
And He said to them, "Strive to enter in through the narrow door; because many, I say to you, will seek to enter in, and will not be able.
Acts 2:40
Also with many other words he testified, and exhorted them, saying, "Be saved from this perverse generation!"
2 Corinthians 6:17
Wherefore, "Come ye out from among them, and be ye separate," saith the Lord, "and touch no unclean thing, and I will receive you;
Revelation 18:4
And I heard another voice out of Heaven saying, "Come forth out of her, my people, that ye have no fellowship with her sins, and that ye receive not of her plagues;