13 Their throat is a grave having been opened; they keep practicing deceit with their tongues; the venom of vipers is under their lips,
Romans 3:13 Cross References - BLB
Matthew 12:34-35
Matthew 23:27-28
27 Woe to you, scribes and Pharisees, hypocrites! For you are like tombs having been whitewashed, which indeed outwardly appear beautiful, but inside they are full of bones of the dead, and of all impurity.
28 Thus indeed outwardly you also appear righteous to men, but inwardly you are full of hypocrisy and lawlessness.
Romans 3:4
4 Never may it be! But let God be true, and every man a liar, as it has been written: “That You may be justified in Your words, and will prevail in Your being judged.”
5 Thus also the tongue is a small member, and boasts exceeding things. Behold a small fire, how great a forest it kindles.
6 The tongue also is a fire, the world of unrighteousness. The tongue is set among our members, defiling all the body, and setting on fire the course of nature, and itself being set on fire by Gehenna.
7 For every species both of beasts and of birds, both of creeping things and things of the sea, is subdued and has been subdued by the human race,
8 but no one of men is able to subdue the tongue; it is an unruly evil, full of deadly poison.