Matthew 15:11

That which comes out of the mouth makes a man unclean, not that which goes into the mouth.

Acts 10:14-15

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

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.

Psalm 10:7

His mouth is full of curses, deception, and oppression. Trouble and wrongdoing are on the tip of his tongue.

Psalm 12:2

People speak lies to one another. They speak with flattering lips and with double-heart. (Double Heart: They say one thing but mean another.)

Psalm 52:2-4

Your tongue makes up wickedness. It is like a sharp razor, you master of deceit.

Psalm 58:3-4

The wicked go astray from the womb. They are wayward as soon as they are born. They speak lies.

Isaiah 37:23

Who is it you have insulted and blasphemed? Against whom have you raised your voice and lifted your eyes in pride? It is against the Holy One of Israel!

Isaiah 59:3-5

Your hands are defiled with blood, and your fingers are desecrated with sin. You speak lies, and you mutter wicked things.

Isaiah 59:13-15

We rebelled and denied Jehovah. We turned away from our God. We spoke about oppression and revolt. We conceived and uttered lies in our hearts.

Jeremiah 9:3-6

They bend their tongue like their bow. Lies and not truth prevail in the land. They move from evil to evil. They do not know me, says Jehovah.

Matthew 12:34-37

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

Matthew 15:18-20

That which comes out of the mouth, comes from the heart and makes a man unclean.

Luke 11:38-41

The Pharisee wondered about Jesus not bathing before dinner.

Acts 11:8-9

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

Romans 3:13-14

Their throat is an open grave. They have practiced deceit with their tongues. The poison of snakes is under their lips. (Psalm 5:9)

Romans 14:14

I know, and am persuaded by the Lord Jesus, that there is nothing unclean in itself. If someone thinks something is unclean it is unclean to him.

Romans 14:17

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

Romans 14:20

Do not tear down the work of God for the sake of food. All things indeed are pure; but it is evil for that man who eats with offense.

1 Timothy 4:4-5

For every creature of God is good, and nothing is to be rejected, if it is received with thanksgiving.

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 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.

James 3:5-8

The tongue also is a little member. It boasts great things. Consider how great a forest fire a small fire kindles!

2 Peter 2:18

For, uttering arrogant words of vanity, they entice in the desires (lusts) of the flesh, by sensuality (lasciviousness), those who are just escaping from the ones who live in error.

Treasury of Scripture Knowledge

Summary

Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.

Bible References

That which goeth

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.
Luke 11:38
The Pharisee wondered about Jesus not bathing before dinner.
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.'
Romans 14:14
I know, and am persuaded by the Lord Jesus, that there is nothing unclean in itself. If someone thinks something is unclean it is unclean to him.
1 Timothy 4:4
For every creature of God is good, and nothing is to be rejected, if it is received with thanksgiving.
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 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

Matthew 15:18
That which comes out of the mouth, comes from the heart and makes a man unclean.
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.
Psalm 10:7
His mouth is full of curses, deception, and oppression. Trouble and wrongdoing are on the tip of his tongue.
Psalm 12:2
People speak lies to one another. They speak with flattering lips and with double-heart. (Double Heart: They say one thing but mean another.)
Psalm 52:2
Your tongue makes up wickedness. It is like a sharp razor, you master of deceit.
Psalm 58:3
The wicked go astray from the womb. They are wayward as soon as they are born. They speak lies.
Isaiah 37:23
Who is it you have insulted and blasphemed? Against whom have you raised your voice and lifted your eyes in pride? It is against the Holy One of Israel!
Isaiah 59:3
Your hands are defiled with blood, and your fingers are desecrated with sin. You speak lies, and you mutter wicked things.
Jeremiah 9:3
They bend their tongue like their bow. Lies and not truth prevail in the land. They move from evil to evil. They do not know me, says Jehovah.
Romans 3:13
Their throat is an open grave. They have practiced deceit with their tongues. The poison of snakes is under their lips. (Psalm 5:9)
James 3:5
The tongue also is a little member. It boasts great things. Consider how great a forest fire a small fire kindles!
2 Peter 2:18
For, uttering arrogant words of vanity, they entice in the desires (lusts) of the flesh, by sensuality (lasciviousness), those who are just escaping from the ones who live in error.

General references

Leviticus 11:2
Tell the Israelites: 'Here are the kinds of land animals you may eat:
Matthew 15:18
That which comes out of the mouth, comes from the heart and makes a man unclean.
Luke 12:57
Why do you not judge what is right?