Matthew 15:17-18
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Jesus is pointing out the obvious, mundane physicality of eating: what goes in just comes out! This isn't about whether food is "clean" or "unclean" in a ritual sense, but highlighting that the real source of defilement isn't external at all, but originates from within the heart.
Do you not see that whatever goes into the mouth passes into the stomach and is expelled? But what comes out of the mouth proceeds from the heart, and this defiles a person.
English Standard Version (ESV)
Jesus has just confronted the Pharisees' hypocrisy regarding ritual hand washing, declaring that true defilement comes from within. When his disciples express concern that the Pharisees are offended, Jesus dismisses their worries, calling the religious leaders blind guides. He then explains to the disciples that physical food entering the body is a purely physical process, passing through the stomach and being expelled, therefore unable to contaminate a person’s spiritual core.
Jesus uses a stark, even slightly gross, analogy to make a profound point. What's the difference between how our bodies handle things and how our souls are affected?
Jesus isn't just talking about hygiene here; He's drawing a clear line between physical processes and spiritual reality. When food goes into your mouth, it goes through your digestive system and is eventually expelled. It's a physical process that doesn't impact your core being, your heart, or your moral standing.
If physical consumption doesn't corrupt us, what does? Jesus points to a surprising source that impacts our entire being.
Jesus contrasts the harmlessness of physical food with the true source of defilement: the human heart. This is where sin originates and where real corruption takes root.
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Understand the original words
kardia · Greek Noun
The center of a person's being, encompassing the mind, will, emotions, and moral character. In biblical theology, it is the source of all intentions and the seat of man's moral activity.
koinoō · Greek Verb
To make ceremonially or morally impure; to render someone unfit for holy presence or fellowship with God. It signifies corruption that separates one from God’s holiness.
Jesus' teaching here directly challenged the deeply ingrained purity laws and traditions of the Pharisees, which were a significant part of Jewish identity and religious practice under Roman rule. By focusing on the internal source of pollution, he was overturning centuries of legalistic interpretation and calling for a radical shift in understanding true righteousness.
c. 28 BC - AD 6
Roman Rule over Judea
Following the Roman conquest, Judea became a client kingdom, and later, direct Roman rule was imposed, shaping the political and social landscape.
c. 4 BC
Herod the Great's Death
The death of Herod the Great led to the division of his kingdom among his sons, creating further political instability and increasing Roman involvement.
c. AD 6
Pontius Pilate Appointed Prefect
Pontius Pilate's appointment as prefect by the Roman emperor signaled increased direct Roman administration and oversight in Judea.
c. AD 28 - 30
Jesus' Public Ministry
Jesus began his public ministry, teaching, healing, and challenging the religious and political authorities of his day.
c. AD 30— this verse
Jesus Teaches on Defilement
Jesus confronts the Pharisees and their disciples about their traditions of ritual purity, arguing that true defilement comes from within, not from external sources like food.
c. AD 30-33
Jesus' Crucifixion and Resurrection
The culmination of Jesus' ministry, leading to his death and resurrection, which profoundly impacted his followers and the early church.
This passage echoes Jesus' point about the physical nature of food, stating that believers can eat whatever is sold in the market without questioning for conscience' sake, as the earth is the Lord's and its fullness.
Romans 14:14Paul directly addresses the idea that nothing is unclean in itself, aligning with Jesus' teaching that external things like food do not defile a person's inner being.
Mark 7:15This parallel account from Mark directly states Jesus' teaching that nothing outside a person can defile them, but what comes from within does, providing a conceptual link to Matthew 15:17.
Jeremiah 17:9This verse describes the deceitful and desperately wicked nature of the human heart, highlighting the internal source of corruption that Jesus speaks of in contrast to physical defilement.
Galatians 5:19-21This passage lists 'works of the flesh,' which directly corresponds to Jesus' explanation in the broader context of Matthew 15 that true defilement comes from sinful actions originating from within, not from external sources like food.
barnesMatthew 15:17: "Do not ye yet understand, that whatsoever entereth in at the mouth goeth into the belly, and is cast out into the draught?"
Do ye not understand ... - The meaning of this may be thus expressed: The food which is eaten does not affect the mind, and therefore cannot pollute it. The doctrine of the Pharisees, that neglect of washing and of similar observances defiles a man, cannot be true. Those things pertain to the body as much as food does, and they cannot affect the soul. That…
calvinMatthew 15:10-20: "And he called the multitude, and said unto them, Hear, and understand:"
- And having called the multitudes to him, he said to them, Hear and understand. 11. What entereth into the mouth polluteth not the man, but what goes out of the mouth polluteth the man. 12. Then his disciples approaching said to him, Knowest thou that the Pharisees were offended when they heard that saying? 13. But he answering, said, Every plant which my heavenly Father hath not planted shall be roote…
Jesus is pointing out the obvious, mundane physicality of eating: what goes in just comes out! This isn't about whether food is "clean" or "unclean" in a ritual sense, but highlighting that the real source of defilement isn't external at all, but originates from within the heart.
Jesus has just confronted the Pharisees' hypocrisy regarding ritual hand washing, declaring that true defilement comes from within. When his disciples express concern that the Pharisees are offended, Jesus dismisses their worries, calling the religious leaders blind guides. He then explains to the disciples that physical food entering the body is a purely physical process, passing through the stomach and being expelled, therefore unable to contaminate a person’s spiritual core.
Jesus has just confronted the Pharisees' hypocrisy regarding ritual hand washing, declaring that true defilement comes from within. When his disciples express concern that the Pharisees are offended, Jesus dismisses their worries, calling the religious leaders blind guides. He then explains to the disciples that physical food entering the body is a purely physical process, passing through the stomach and being expelled, therefore unable to contaminate a person’s spiritual core.
"Do you not see that whatever goes into the mouth passes into the stomach and is expelled? But what comes out of the mouth proceeds from the heart, and this defiles a person." — Jesus is pointing out the obvious, mundane physicality of eating: what goes in just comes out! This isn't about whether food is "clean" or "unclean" in a ritual sense, but highlighting that the real…
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Last reviewed October 2026
