romans 3:13 Their throat is an open sepulchre; with their tongues they have used deceit; the poison of asps is under their lips: - Free Bible Online

      13-18. Their, &c.--From generals, the apostle here comes to particulars, culling from different parts of Scripture passages which speak of depravity as it affects the different members of the body; as if to show more affectingly how "from the sole of the foot even to the head there is no soundness" in us.
      throat is an open sepulchre-- (Ps 5:9); that is, "What proceeds out of their heart, and finds vent in speech and action through the throat, is like the pestilential breath of an open grave."
      with their tongues they have used deceit-- (Ps 5:9); that is, "That tongue which is man's glory (Ps 16:9; 57:8) is prostituted to the purposes of deception."
      the poison of asps is under their lips-- (Ps 140:3): that is, "Those lips which should 'drop as an honeycomb,' and 'feed many,' and 'give thanks unto His name' (So 4:11; Pr 10:21; Heb 13:15), are employed to secrete and to dart deadly poison."

JFB.