These lips

 

 These lips are made for talkin'

And that's just what they'll do

One of these days these lips are gonna talk all about you

 

Thoughtless comments. Careless whispers. Repeated gossip. The meaningful "tut ... tut ..." said innocently yet hiding many a hurt.

How wounding are those seemingly blameless lips when they utter words without thinking; or perhaps maliciously intentionally so.

Whether said in jest, whether said in all seriousness, or whether said deliberately, under oath even, those lips can do more harm than the sharpest sword.

  Thou shalt not bear false witness against thy neighbour