Matthew 7:13-14
Enter by the narrow gate: for [the gate] is broad and the road is wide that leads to destruction, and many enter that way.
Luke 13:24
"Strive to get in through the narrow door, for I tell you many will try to get in and not be able,
Acts 2:40
And with many another appeal he urged and entreated them. "Save yourselves," he cried, "from this crooked generation!"
2 Corinthians 6:17
Therefore come away from them, separate, saith the Lord, touch not what is unclean; then I will receive you,
Revelation 18:4
And I heard another voice from heaven crying, "Come out of her, O my people, that you share not her sins, that you partake not of her plagues: