mightie shall speak] To make the matter more sensible, he useth a poticall and ironicall representation, of the entertainment which other Princes and warlike nations, and especially those which were Egypts confederates and were already dead, would give Pharaoh at his coming into hll. See Isaiah 14:9. Or when he shall be brought down, Isa. 14. 14, 15. Matthew 11:23.
his graves] Namely, the graves of his men which were slain in the warres.