1 Corinthians 5:8-10

New International Version - UK

⁸ Therefore let us keep the Festival, not with the old bread leavened with malice and wickedness, but with the unleavened bread of sincerity and truth.

⁹ I wrote to you in my letter not to associate with sexually immoral people – ¹⁰ not at all meaning the people of this world who are immoral, or the greedy and swindlers, or idolaters. In that case you would have to leave this world.