Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world.
1 Corinthians 11:19
For there must be also heresies among you, that they which are approved may be made manifest among you.
1 Corinthians 15:25
For he must reign, till he hath put all enemies under his feet.
1 Corinthians 15:53
For this corruptible must put on incorruption, and this mortal must put on immortality.