Matthew 12:34

O race of vipers, how can ye speak good things, who are yourselves so wicked? for out of the abundance of the heart the mouth speaketh.

Luke 6:45

A good man, out of the good treasure of his heart, bringeth forth that which is good; and an evil man, out of the evil treasure of his heart, bringeth forth that which is evil: for out of the abundance of the heart his mouth speaketh.

Matthew 23:33

how can ye escape the damnation of hell?

Matthew 3:7

But when he saw many of the pharisees and sadducees coming to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?

Matthew 15:18

But the things, which proceed out of the mouth, come from the heart, and those defile a man.

James 3:5-8

So the tongue is a small part of the body, yet boasteth great things. Behold how much fuel a little fire kindleth!

Luke 3:7

Therefore said he to the multitudes that came to be baptised by him, O generation of vipers, who hath warned you to flee from the wrath to come?

Matthew 12:35

A good man out of the good treasure of the heart produceth good things; and a wicked man out of the wicked treasure uttereth wicked things:

John 8:44

Ye are of your father the devil, and are bent upon doing the lusts of your father: he was a murderer from the beginning, and continued not in the truth: for there is no truth in him. When he speaketh a lie, he speaketh like himself, for he is a liar, and the father of such.

Ephesians 4:29

Let no corrupt word come out of your mouth; but what is good to useful edification, that it may benefit the hearers.

Romans 3:10-14

"There is none righteous, no not one;

1 John 3:10

In this the children of God are manifest, and the children of the devil: whosoever doth not practise righteousness, and he who loveth not his brother, is not of God:

Treasury of Scripture Knowledge

Summary

O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.

For

General references

Bible References

Generation

Matthew 3:7
But when he saw many of the pharisees and sadducees coming to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?
Matthew 23:33
how can ye escape the damnation of hell?
Luke 3:7
Therefore said he to the multitudes that came to be baptised by him, O generation of vipers, who hath warned you to flee from the wrath to come?
John 8:44
Ye are of your father the devil, and are bent upon doing the lusts of your father: he was a murderer from the beginning, and continued not in the truth: for there is no truth in him. When he speaketh a lie, he speaketh like himself, for he is a liar, and the father of such.
1 John 3:10
In this the children of God are manifest, and the children of the devil: whosoever doth not practise righteousness, and he who loveth not his brother, is not of God:

How

Romans 3:10
"There is none righteous, no not one;
James 3:5
So the tongue is a small part of the body, yet boasteth great things. Behold how much fuel a little fire kindleth!

For

Luke 6:45
A good man, out of the good treasure of his heart, bringeth forth that which is good; and an evil man, out of the evil treasure of his heart, bringeth forth that which is evil: for out of the abundance of the heart his mouth speaketh.

General references

Matthew 15:18
But the things, which proceed out of the mouth, come from the heart, and those defile a man.
Mark 7:20
But said He, What cometh out of a man, that defileth the man;