1 Peter 2:22

He committed no sin, and deceit was never on his lips.

James 1:26

If anyone thinks he is religious, and does not bridle his tongue, but deceives himself, his religious observances are of no account.

James 3:2

For we all make many mistakes. Anyone who never makes a mistake in what he says has a character that is fully developed and is able to control his whole body as well.

1 Peter 2:1

Free yourselves, therefore, from all malice, deceit, hypocrisy, envy, and slander of any kind,

Matthew 12:35-37

A good man, out of the good he has accumulated, brings out things that are good, and a bad man, out of what he has accumulated that is bad, brings out things that are bad.

Colossians 3:9

You must not lie to one another. For you have stripped off your old self with its ways

James 1:19

You must understand this, my dear brothers. Everyone must be quick to hear, slow to speak, slow to be angry,

James 3:5-10

So the tongue is a little organ and yet very boastful. What a great forest a spark will set on fire!

Revelation 14:4-5

They are the men who have not been defiled by relations with women; they are celibates. It is they who follow the Lamb wherever he goes. They have been ransomed from among men as the first-fruits for God and the Lamb,

Treasury of Scripture Knowledge

Summary

Keep thy tongue from evil, and thy lips from speaking guile.

Bible References

Keep

Matthew 12:35
A good man, out of the good he has accumulated, brings out things that are good, and a bad man, out of what he has accumulated that is bad, brings out things that are bad.
James 1:19
You must understand this, my dear brothers. Everyone must be quick to hear, slow to speak, slow to be angry,
James 3:2
For we all make many mistakes. Anyone who never makes a mistake in what he says has a character that is fully developed and is able to control his whole body as well.

Speaking

Colossians 3:9
You must not lie to one another. For you have stripped off your old self with its ways
1 Peter 2:1
Free yourselves, therefore, from all malice, deceit, hypocrisy, envy, and slander of any kind,
Revelation 14:4
They are the men who have not been defiled by relations with women; they are celibates. It is they who follow the Lamb wherever he goes. They have been ransomed from among men as the first-fruits for God and the Lamb,