Matthew 15:18

But the things which proceed out of the mouth come out of the heart, and they defile the man.

Matthew 12:34

You offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart, the mouth speaks.

Proverbs 15:2

The tongue of the wise commends knowledge, but the mouth of fools gush out folly.

Proverbs 15:28

The heart of the righteous weighs answers, but the mouth of the wicked gushes out evil.

Matthew 15:11

That which enters into the mouth does not defile the man; but that which proceeds out of the mouth, this defiles the man."

James 3:6-10

And the tongue is a fire. The world of iniquity among our members is the tongue, which defiles the whole body, and sets on fire the course of nature, and is set on fire by hell.

1 Samuel 24:13

As the proverb of the ancients says, 'Out of the wicked comes forth wickedness;' but my hand shall not be on you.

Psalm 36:3

The words of his mouth are iniquity and deceit. He has ceased to be wise and to do good.

Proverbs 6:12

A worthless person, a man of iniquity, is he who walks with a perverse mouth;

Proverbs 10:32

The lips of the righteous know what is acceptable, but the mouth of the wicked is perverse.

Luke 19:22

"He said to him, 'Out of your own mouth will I judge you, you wicked servant. You knew that I am an exacting man, taking up that which I did not lay down, and reaping that which I did not sow.

Revelation 13:5-6

A mouth was given to him speaking proud words and blasphemies. There was given to him authority to act for forty-two months.

Treasury of Scripture Knowledge

Summary

But those things which proceed out of the mouth come forth from the heart; and they defile the man.

Bible References

General references

Matthew 15:11
That which enters into the mouth does not defile the man; but that which proceeds out of the mouth, this defiles the man."
Matthew 12:34
You offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart, the mouth speaks.
1 Samuel 24:13
As the proverb of the ancients says, 'Out of the wicked comes forth wickedness;' but my hand shall not be on you.
Psalm 36:3
The words of his mouth are iniquity and deceit. He has ceased to be wise and to do good.
Proverbs 6:12
A worthless person, a man of iniquity, is he who walks with a perverse mouth;
Proverbs 10:32
The lips of the righteous know what is acceptable, but the mouth of the wicked is perverse.
Proverbs 15:2
The tongue of the wise commends knowledge, but the mouth of fools gush out folly.
Luke 19:22
"He said to him, 'Out of your own mouth will I judge you, you wicked servant. You knew that I am an exacting man, taking up that which I did not lay down, and reaping that which I did not sow.
James 3:6
And the tongue is a fire. The world of iniquity among our members is the tongue, which defiles the whole body, and sets on fire the course of nature, and is set on fire by hell.
Revelation 13:5
A mouth was given to him speaking proud words and blasphemies. There was given to him authority to act for forty-two months.