Mark 7:15

Nothing that goes into a person from the outside can make him unclean. That which comes from inside of a man can make him unclean.

Leviticus 11:42-47

Do not eat any creature with many legs that goes on its belly or on the ground like a four-legged animal, or any creature that swarms on the ground. Consider them disgusting.

Proverbs 4:23

Guard your heart with all diligence for out of it come the source of life.

Matthew 12:34

You offspring of vipers. How can you who are evil speak good things? Out of the abundance of the heart the mouth speaks.

Matthew 15:16

He replied: Are you, like them, without wisdom?

Mark 7:18-23

He replied: Do you not understand? Do you not know that which goes into the man from the outside cannot defile him?

Acts 10:14-16

But Peter said: No Lord for I have never eaten any thing that is defiled or unclean.

Acts 10:28

He said to them: You know that it is an unlawful thing for a man who is a Jew to keep company, or approach someone of another nation. But God revealed to me that I should not call any man defiled or unclean.

Acts 11:8-10

I said, 'No Lord, for nothing defiled or unclean has at any time entered into my mouth.'

Acts 15:20-21

We should write to them that they should abstain from things polluted by idols, from fornication, from things strangled and from blood.

Romans 14:17

For the kingdom of God is not food and drink; but righteousness and peace and joy in the Holy Spirit.

1 Corinthians 10:25

Eat whatever is sold in the meat market without asking questions for the sake of conscience.

1 Timothy 4:3-5

They will forbid marrying, [and command] to abstain from food, which God created to be received with thanksgiving by those who believe and know the truth.

Titus 1:15

To the pure all things are pure, but to those who are defiled and unbelieving nothing is pure. Both their mind and their conscience are defiled.

Hebrews 9:10

since they have to do only with food, drink, and various purification ceremonies. These are all outward rules, which apply only until the time comes to change them for something better.

Hebrews 13:9

Do not be carried away by varied (different) and strange teachings. It is good that the heart is established by grace and not by food. Those who are occupied by them are not benefited.

Treasury of Scripture Knowledge

Summary

There is nothing from without a man, that entering into him can defile him: but the things which come out of him, those are they that defile the man.

Bible References

Nothing

Mark 7:18
He replied: Do you not understand? Do you not know that which goes into the man from the outside cannot defile him?
Leviticus 11:42
Do not eat any creature with many legs that goes on its belly or on the ground like a four-legged animal, or any creature that swarms on the ground. Consider them disgusting.
Acts 10:14
But Peter said: No Lord for I have never eaten any thing that is defiled or unclean.
Acts 11:8
I said, 'No Lord, for nothing defiled or unclean has at any time entered into my mouth.'
Acts 15:20
We should write to them that they should abstain from things polluted by idols, from fornication, from things strangled and from blood.
Romans 14:17
For the kingdom of God is not food and drink; but righteousness and peace and joy in the Holy Spirit.
1 Corinthians 10:25
Eat whatever is sold in the meat market without asking questions for the sake of conscience.
1 Timothy 4:3
They will forbid marrying, [and command] to abstain from food, which God created to be received with thanksgiving by those who believe and know the truth.
Titus 1:15
To the pure all things are pure, but to those who are defiled and unbelieving nothing is pure. Both their mind and their conscience are defiled.
Hebrews 9:10
since they have to do only with food, drink, and various purification ceremonies. These are all outward rules, which apply only until the time comes to change them for something better.
Hebrews 13:9
Do not be carried away by varied (different) and strange teachings. It is good that the heart is established by grace and not by food. Those who are occupied by them are not benefited.

But

Mark 7:20
That which comes out of the man defiles the man.
Proverbs 4:23
Guard your heart with all diligence for out of it come the source of life.
Matthew 12:34
You offspring of vipers. How can you who are evil speak good things? Out of the abundance of the heart the mouth speaks.
Matthew 15:16
He replied: Are you, like them, without wisdom?

General references

Leviticus 11:2
Tell the Israelites: 'Here are the kinds of land animals you may eat:
Jeremiah 25:2
The prophet Jeremiah spoke to all the people of Judah and to everyone who lived in Jerusalem. He said:
Matthew 13:9
He that has ears let him hear.
Mark 7:20
That which comes out of the man defiles the man.