Matthew 15:18-20 elaborates that evil thoughts and actions from the heart are what defile, directly unpacking the metaphor.

Matthew 12:34-37 teaches that speech reveals the heart and brings judgment, grounding the same principle of inner defilement.

Romans 3:13 quotes Psalm 5:9 about 'open grave' throats and deceit—directly showing the defiling power of evil speech.

In Acts 11:8, Peter repeats his objection, showing persistent adherence to dietary laws that Jesus' teaching contradicts.

In Acts 10:15, God's command reinforces Jesus' principle: what God has cleansed cannot be called impure, directly affirming the teaching about food not defiling.

In Acts 10:14, Peter's refusal to eat unclean food contradicts Jesus' teaching that food does not defile, highlighting tension between old and new.

Luke 11:38-40 addresses external vs internal purity, echoing Matthew 15:11's teaching that defilement comes from within.

Mark 7:15 records the same teaching about defilement coming from within, not from what enters—a direct parallel.

In Acts 11:9, the divine command is reiterated, directly supporting Jesus' statement that food does not defile.

Isaiah 59:3-4 explicitly states that lips speaking lies and wickedness defile, directly paralleling Jesus' teaching.

Romans 3:14 adds cursing and bitterness—further examples of the defiling words Jesus refers to.

In Romans 14:14, Paul affirms Jesus' teaching that nothing is unclean in itself, while adding the conscience qualification.

In Romans 14:20, Paul explicitly states 'all food is clean,' directly reflecting Jesus' declaration, while adding the caution about causing others to stumble.

In 1 Timothy 4:4, Paul teaches that all created foods are good and not to be rejected, reinforcing Jesus' point that food does not defile.

In Titus 1:15, Paul teaches that purity is a matter of inner faith, echoing Jesus' contrast between external and internal defilement.

James 3:5-8 describes the tongue as a fire corrupting the whole body—expanding on Jesus' point that what comes out defiles.

Leviticus 11:8 forbids touching unclean carcasses—the external defilement Jesus overturns with his teaching.

James 3:6 calls the tongue a world of unrighteousness—directly reinforcing Jesus' message about defiling speech.

Leviticus 11:2 gives dietary laws about clean animals—showing the OT food laws Jesus contrasts with inner purity.

Jeremiah 9:3-6 exposes deceitful speech and treachery, illustrating what Jesus means by words that defile from the heart.

Isaiah 59:13-15 describes sins of speech and injustice—the very 'defiling' speech Jesus says corrupts a person from within.

Psalm 52:2-4 depicts a tongue plotting destruction and loving evil, exemplifying defiling speech from a wicked heart.

Psalm 12:2 portrays flattering lips and a double heart, showing how deceitful speech reflects inner corruption.

Psalm 10:7 describes a mouth full of curses and deceit, illustrating the kind of speech that defiles a person.

Isaiah 37:23 records blasphemous speech against God, a concrete example of the defiling words Jesus warns about.

Psalm 58:4 compares wicked speech to serpent venom, showing the poisonous nature of what comes from the mouth.

In Romans 14:17, Paul expands Jesus' idea: the kingdom focuses on spiritual matters, not food regulations.

Psalm 58:3 says the wicked speak lies from birth, connecting innate corruption to the defiling speech Jesus highlights.

Colossians 2:16 tells believers not to judge over food and drink—applying Jesus' rejection of dietary defilement in the church.

Hebrews 13:9 echoes that foods do not spiritually benefit, reinforcing Jesus' point that external intake does not defile.

2 Peter 2:18 warns of false teachers' arrogant speech that entices—a concrete example of defiling words.