μιαίνω

Μιαίνω (miaínō) means to defile, stain, or contaminate. John 18:28 uses it within a sharp narrative irony. Jesus' accusers avoid entering the governor's headquarters so they will not become ceremonially defiled before eating the Passover, yet they are seeking the death of the innocent Son. John does not dismiss biblical purity or identify every concern about ritual as hypocrisy. He exposes the tragedy of guarding an external boundary while committing grave injustice.

The other New Testament uses move from conscience to community and conduct. Titus 1:15 says that unbelief can defile both mind and conscience. Hebrews 12:15 warns that a root of bitterness can trouble and defile many. Jude describes false teachers who defile the flesh while rejecting authority. The word therefore can name contamination that spreads through thought, desire, behavior, and relationships.

Pastoral use must be careful. Defilement language has often been weaponized against bodies, trauma survivors, ethnic groups, or people carrying shame. The New Testament directs attention toward unbelief, corrupt desire, bitterness, and injustice, not toward declaring sufferers dirty. In Christ, cleansing is real, and the church should become a community where sin is confronted without placing false shame on those who have been sinned against.

The verb exposes ritual-moral irony in John and warns elsewhere about defiled conscience, contagious bitterness, and corrupt conduct.