Parallel
Psalms 5:10
Jewish Publication Society 1917 · Berean Standard Bible
For there is no sincerity in their mouth; Their inward part is a yawning gulf, Their throat is an open sepulchre; They make smooth their tongue.
5:9
For not a word they speak can be trusted; destruction lies within them. Their throats are open graves; their tongues practice deceit (note: Or flattery; cited in Romans 3:13).