'Defilement' in the Bible

Having therefore these promises, beloved, let us cleanse ourselves from all defilement of flesh and spirit, perfecting holiness in the fear of God.

but chiefly those who walk after the flesh in the lust of defilement, and despise authority. Daring, self-willed, they are not afraid to speak evil of dignitaries;

For if, after they have escaped the defilement of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in it and overcome, the last state has become worse for them than the first.