What does the Bible say about the separation of believers and unbelievers?

In Matthew 13:49, it is stated that the angels will come forth and separate the wicked from the just at the end of the world. This separation mirrors the parable of the net where good fish are gathered into vessels while the bad fish are cast away. This signifies the ultimate judgment where believers will be taken to glory while unbelievers will face eternal separation from Christ. The distinction between the two groups is not always apparent in this life, as local assemblies often contain both good and bad 'fish', illustrating the mixed nature of church congregations until the final judgment.