Matthew 15:18

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

Matthew 12:34

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 uses knowledge rightly, but the mouth of fools pours out foolishness.

Proverbs 15:28

The heart of the righteous studies to answer, but the mouth of the wicked pours out evil things.

Matthew 15:11

Not that which goes into the mouth defiles a man; but that which comes out of the mouth, this defiles a man.

James 3:6-10

And the tongue is a fire, a world of iniquity. So the tongue is set among our members, spotting all the body and inflaming the course of nature, and being inflamed by hell.

1 Samuel 24:13

As the ancient proverb says, Wickedness proceeds from the wicked. But my hand shall not be on you.

Psalm 36:3

The words of his mouth are evil and deceit; he has stopped acting wisely and doing good.

Proverbs 6:12

A worthless person, a wicked man walks with a crooked mouth,

Proverbs 10:32

The lips of the righteous know what is pleasing; but the mouth of the wicked what is contrary.

Luke 19:22

And he said to him, I will judge you out of your own mouth, wicked servant! You knew that I was a harsh man, taking up what I had not laid down and reaping what I did not sow.

Revelation 13:5-6

And a mouth speaking great things was given to it, and blasphemies. And authority was given to it to continue 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
Not that which goes into the mouth defiles a man; but that which comes out of the mouth, this defiles a man.
Matthew 12:34
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 ancient proverb says, Wickedness proceeds from the wicked. But my hand shall not be on you.
Psalm 36:3
The words of his mouth are evil and deceit; he has stopped acting wisely and doing good.
Proverbs 6:12
A worthless person, a wicked man walks with a crooked mouth,
Proverbs 10:32
The lips of the righteous know what is pleasing; but the mouth of the wicked what is contrary.
Proverbs 15:2
The tongue of the wise uses knowledge rightly, but the mouth of fools pours out foolishness.
Luke 19:22
And he said to him, I will judge you out of your own mouth, wicked servant! You knew that I was a harsh man, taking up what I had not laid down and reaping what I did not sow.
James 3:6
And the tongue is a fire, a world of iniquity. So the tongue is set among our members, spotting all the body and inflaming the course of nature, and being inflamed by hell.
Revelation 13:5
And a mouth speaking great things was given to it, and blasphemies. And authority was given to it to continue forty-two months.