They speak vanity every one with his neighbour: [with] (b) flattering lips [and] with a double heart do they speak.
(b) He means the flatters of the court which hurt him more with their tongues than with their weapons.
Related Commentaries of Psalms 12:2
Psalms 12:2
2 They speak vanity every one with his neighbour: with flattering lips and with a doublea heart do they speak.