Wesley's Explanatory Notes

They have sharpened their tongues like a serpent; adders' poison is under their lips. /*Selah*/.

Tongues — Using words as sharp and piercing as the sting of a serpent.

As for the head of those that compass me about, let the mischief of their own lips cover them.

Mischief — The mischief which they design against me, shall fall upon themselves.

Let burning coals fall upon them: let them be cast into the fire; into deep pits, that they rise not up again.

Coals — Divine vengeance, which is compared to coals of fire.

Surely the righteous shall give thanks unto thy name: the upright shall dwell in thy presence.

Dwell — Shall constantly enjoy thy gracious and powerful presence.