Matthew 12:34

O vipers' brood, how can you speak what is good when you are evil? For it is from the overflow of the heart that the mouth speaks.

Romans 3:13-14

"Their throats resemble an opened grave; with their tongues they have been talking deceitfully." "The venom of vipers lies hidden behind their lips."

James 3:6-8

And the tongue is a fire. That world of iniquity, the tongue, is placed within us spotting and soiling our whole nature, and setting the whole round of our lives on fire, being itself set on fire by Gehenna.

Treasury of Scripture Knowledge

Summary

His mouth is full of cursing and deceit and fraud: under his tongue is mischief and vanity.

And deceit

General references

Bible References

Full

Romans 3:14
"Their mouths are full of cursing and bitterness."

And deceit

Romans 3:13
"Their throats resemble an opened grave; with their tongues they have been talking deceitfully." "The venom of vipers lies hidden behind their lips."

General references

Romans 3:14
"Their mouths are full of cursing and bitterness."