Psalm 5:9

Not a word from their mouth can be trusted; their heart is filled with malice. Their throat is an open grave; with their tongues they tell lies.

Their throat is an open grave 
Jeremiah 5:16  "Their quivers are like an open grave; all of them are mighty warriors." (the Babylonians)
Luke 11:44  "Woe to you, because you are like unmarked graves, which people walk over without knowing it."

with their tongues they tell lies 
Psalm 12:2  Everyone lies to their neighbor; they flatter with their lips but harbor deception in their hearts.
Psalm 28:3  Do not drag me away with the wicked, with those who do evil, who speak cordially with their neighbors but harbor malice in their hearts.
Psalm 36:3  The words of their mouths are wicked and deceitful; they fail to act wisely or do good.
Proverbs 15:4  The soothing tongue is a tree of life, but a perverse tongue crushes the spirit.
Jeremiah 9:8  "Their tongue is a deadly arrow; it speaks deceitfully. With their mouths they all speak cordially to their neighbors, but in their hearts they set traps for them."
Romans 3:13-14  "Their throats are open graves; their tongues practice deceit." (Psalm 5:9) "The poison of vipers is on their lips." (Psalm 140:3) "Their mouths are full of cursing and bitterness." (Psalm 10:7)

(parentheses are mine)

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
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