Matthew 12:36-37

But I tell you that for every careless word that men shall speak they will be held accountable on the day of Judgement.

James 1:26

If a man thinks that he is scrupulously religious, although he is not curbing his tongue but is deceiving himself, his religious service is worthless.

James 3:2-12

For we often stumble and fall, all of us. If there is any one who never stumbles in speech, that man has reached maturity of character and is able to curb his whole nature.

Treasury of Scripture Knowledge

Summary

He that keepeth his mouth keepeth his life: but he that openeth wide his lips shall have destruction.

General references

Bible References

General references

Matthew 12:36
But I tell you that for every careless word that men shall speak they will be held accountable on the day of Judgement.
James 1:26
If a man thinks that he is scrupulously religious, although he is not curbing his tongue but is deceiving himself, his religious service is worthless.
James 3:2
For we often stumble and fall, all of us. If there is any one who never stumbles in speech, that man has reached maturity of character and is able to curb his whole nature.