34 You brood of vipers, how can you speak good when you are evil? For the mouth utters what the heart is full of.
Matthew 12:34 Cross References - Moffatt
Matthew 3:7
7 But when he noticed a number of the Pharisees and Sadducees coming for his baptism, he said to them, "You brood of vipers, who told you to flee from the coming Wrath?
Matthew 12:35
35 The good man brings good out of his good store, and the evil man brings evil out of his store of evil.
Matthew 15:18
18 while what comes out of the mouth comes from the heart — and that is what defiles a man.
Matthew 23:33
33 You serpents! you brood of vipers! how can you escape being sentenced to Gehenna?
Luke 3:7
7 To the crowds who came out to get baptized by him John said, "You brood of vipers, who told you to flee from the coming Wrath?
Luke 6:45
45 The good man produces good from the good stored in his heart, and the evil man evil from his evil: for a man's mouth utters what his heart is full of.
John 8:44
44 You belong to your father the devil, and you want to do what your father desires; he was a slayer of men from the very beginning, and he has no place in the truth because there is no truth in him: when he tells a lie, he is expressing his own nature, for he is a liar and the father of lies.
Romans 3:10-14
10 as it is written, None is righteous, no, not one;
11 no one understands, no one seeks for God.
12 All have swerved, one and all have gone wrong, no one does good, not a single one.
13 Their throat is an open grave, they are treacherous with their tongues, the venom of an asp lies under their lips.
14 Their mouth is full of cursing and bitterness,
Ephesians 4:29
29 Let no bad word pass your lips, but only such speech as is good for edification, as occasion may require, words that are gracious and a means of grace to those who hear them.
James 3:5-8
5 So the tongue is a small member of the body, but it can boast of great exploits. What a forest is set ablaze by a little spark of fire!
6 And the tongue is a fire, the tongue proves a very world of mischief among our members, staining the whole of the body and setting fire to the round circle of existence with a flame fed by hell.
7 For while every kind of beast and bird, of creeping animals and creatures marine, is tameable and has been tamed by mankind,
8 no man can tame the tongue — plague of disorder that it is, full of deadly venom!
1 John 3:10
10 Here is how the children of God and the children of the devil are recognized; anyone who does not practise righteousness does not belong to God, and neither does he who has no love for his brother.