1 Peter 2:22

Who did no sin, neither was guile found in his mouth:

James 1:26

If any among you seem to be religious, and bridleth not his tongue, but deceiveth his heart, this man's devotion is vain.

James 3:2

and if any offend not in word, he is a compleat man, able to manage also the whole body.

1 Peter 2:1

Therefore laying aside all malice, and all deceit, and hypocrisies,

Matthew 12:35-37

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:

Colossians 3:9

Lie not one to another, seeing ye have put off the old man with his evil practices;

James 1:19

Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath:

James 3:5-10

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

Revelation 14:4-5

These are they who were not defiled with women; for they are virgins: these are they who follow the Lamb whithersoever He goeth: these were redeemed from among men, as the first-fruits unto 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 treasure of the heart produceth good things; and a wicked man out of the wicked treasure uttereth wicked things:
James 1:19
Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath:
James 3:2
and if any offend not in word, he is a compleat man, able to manage also the whole body.

Speaking

Colossians 3:9
Lie not one to another, seeing ye have put off the old man with his evil practices;
1 Peter 2:1
Therefore laying aside all malice, and all deceit, and hypocrisies,
Revelation 14:4
These are they who were not defiled with women; for they are virgins: these are they who follow the Lamb whithersoever He goeth: these were redeemed from among men, as the first-fruits unto God and the Lamb.