Commentaries:
Jamieson, Fausset, and Brown
The wicked are not reliable because by nature they are full of wickedness, or literally, "wickednesses," of every kind (Romans 8:7).
sepulchre—a dwelling-place of corruption, emitting moral putridness.
flatter—or, "make smooth."
their tongue—speaks deceitfully.
Other Jamieson, Fausset, and Brown entries containing Psalms 5:9:
Psalms 5:1
Psalms 52:2
Psalms 55:11
Psalms 55:15
Psalms 62:4
Psalms 91:3
Psalms 140:6
Proverbs 2:16-19
Proverbs 10:6
Jeremiah 5:16
Matthew 23:27
Luke 11:44
Romans 3:13-18
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