1 Peter 2:22

He did no sin, nor was guile found in his mouth.

James 1:26

If any one among you seems to be religious, and bridles not his tongue, but deceives his own heart, this man's religion is vain.

James 3:2

For in many things we all offend. If any one offends not in word, he is a perfect man, able also to bridle the whole body.

1 Peter 2:1

Therefore, laying aside all malice, and all guile, and hypocrisies, and envyings, and all evil speakings,

Matthew 12:35-37

The good man, out of his good treasury, brings forth good things; and the evil man, out of his evil treasury, brings forth evil things.

Colossians 3:9

Lie not one to another, seeing that you have put off the old man with his deeds,

James 1:19

So, then, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath.

James 3:5-10

So, also, the tongue is a little member, and boasts great things. Behold, how great a forest does a little fire set in a blaze.

Revelation 14:4-5

These are they that were not defiled with women; for they are virgins; these are they that follow the Lamb wherever he goes: these were redeemed from among men, the first-fruits to God and to the Lamb.

Treasury of Scripture Knowledge

Summary

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

Bible References

Keep

Matthew 12:35
The good man, out of his good treasury, brings forth good things; and the evil man, out of his evil treasury, brings forth evil things.
James 1:19
So, then, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath.
James 3:2
For in many things we all offend. If any one offends not in word, he is a perfect man, able also to bridle the whole body.

Speaking

Colossians 3:9
Lie not one to another, seeing that you have put off the old man with his deeds,
1 Peter 2:1
Therefore, laying aside all malice, and all guile, and hypocrisies, and envyings, and all evil speakings,
Revelation 14:4
These are they that were not defiled with women; for they are virgins; these are they that follow the Lamb wherever he goes: these were redeemed from among men, the first-fruits to God and to the Lamb.