James 3:5

So also the tongue is a small member and makes great boasts. Behold, how great a forest is set on fire by a little spark!

Revelation 13:5-6

And he was permitted to utter loud boasts and blasphemies; and there was given to him authority to continue forty-two months.

2 Peter 2:18

For speaking great swelling words of vanity, they entangle, by their lasciviousness, in the lusts of the flesh, those who are just about to escape from the men that live in misconduct.

Jude 1:16

For these are murmurers, always complaining. They always go where their passions lead, and their mouth speaks great swelling words, while they pay court to men for the sake of the advantage they can get.

Treasury of Scripture Knowledge

Summary

Even so the tongue is a little member, and boasteth great things. Behold, how great a matter a little fire kindleth!

Bible References

So

2 Peter 2:18
For speaking great swelling words of vanity, they entangle, by their lasciviousness, in the lusts of the flesh, those who are just about to escape from the men that live in misconduct.
Jude 1:16
For these are murmurers, always complaining. They always go where their passions lead, and their mouth speaks great swelling words, while they pay court to men for the sake of the advantage they can get.
Revelation 13:5
And he was permitted to utter loud boasts and blasphemies; and there was given to him authority to continue forty-two months.