* who is.
   It seems to have been a general opinion, that if God appeared
   to men, it was for the purpose of destroying them.  And indeed
   most of the extraordinary manifestations of God were in the
   way of judgment; but here it was widely different.  God did
   appear in a sovereign and extraordinary manner; but it was for
   the instruction, direction, deliverance, and support of his
   people.  1.  They heard this voice speaking with them in a
   distinct, articulate manner.  2.  They saw the fire, the
   symbol of his presence, the appearances of which demonstrated
   it to be supernatural.  3.  Notwithstanding God appeared so
   terrible, yet no person was destroyed; for he came not to
   destroy but to save.

  4:33 
 * all flesh.
  Ge 6:12  Isa 40:6  Ro 3:20 
 * living.
  Jos 3:10  Ps 42:2  84:2  Jer 10:10  Da 6:26  Mt 26:63  Ac 14:15 
  2Co 6:16  1Th 1:9