'Defiled' in the Bible

Be carefully on your guard lest there be any one who falls back from the grace of God; lest any root bearing bitter fruit spring up and cause trouble among you, and through it the whole brotherhood be defiled;

These are those who had not defiled themselves with women: they are as pure as virgins. They follow the Lamb wherever He goes. They have been redeemed from among men, as firstfruits to God and to the Lamb.