1 Peter 2:22

He 'never sinned, nor was anything deceitful ever heard from his lips.'

James 1:26

When a man appears to be religious, yet does not bridle his tongue, but imposes upon his own conscience, that man's religious observances are valueless.

James 3:2

We often make mistakes, every one of us. Any one who does not make mistakes when speaking is indeed a perfect man, able to bridle his whole body as well.

1 Peter 2:1

Now that you have done with all malice, all deceitfulness, insincerity, jealous feelings, and all back-biting,

Matthew 12:35-37

A good man, from his good stores, produces good things; while an evil man, from his evil stores, produces evil things.

Colossians 3:9

Never lie to one another. Get rid of your old self and its habits,

James 1:19

Mark this, my dear Brothers--Let every one be quick to listen, slow to speak, and slow to get angry;

James 3:5-10

So is it with the tongue. Small as it is, it is a great boaster. Think how tiny a spark may set the largest forest ablaze!

Revelation 14:4-5

These are the men who never defiled themselves in their intercourse with women; they are as pure as virgins. These are the men who follow the Lamb wherever he goes. They were redeemed as the first-fruits of mankind for God and for 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, from his good stores, produces good things; while an evil man, from his evil stores, produces evil things.
James 1:19
Mark this, my dear Brothers--Let every one be quick to listen, slow to speak, and slow to get angry;
James 3:2
We often make mistakes, every one of us. Any one who does not make mistakes when speaking is indeed a perfect man, able to bridle his whole body as well.

Speaking

Colossians 3:9
Never lie to one another. Get rid of your old self and its habits,
1 Peter 2:1
Now that you have done with all malice, all deceitfulness, insincerity, jealous feelings, and all back-biting,
Revelation 14:4
These are the men who never defiled themselves in their intercourse with women; they are as pure as virgins. These are the men who follow the Lamb wherever he goes. They were redeemed as the first-fruits of mankind for God and for the Lamb.