Exodus 11:1
11:1 And the LORD said unto Moses, Yet will I bring one plague
     [more] upon Pharaoh, and upon Egypt; afterwards he will let
     you go hence: when he shall let [you] go, he shall {a}
     surely thrust you out hence altogether.

     (a) Without any condition, but with haste and violence.

Exodus 11:5
11:5 And all the firstborn in the land of Egypt shall die, from
     the firstborn of Pharaoh that sitteth upon his throne, even
     unto the firstborn of the maidservant that [is] behind {b}
     the mill; and all the firstborn of beasts.

     (b) From the highest to the lowest.

Exodus 11:8
11:8 And all these thy servants shall come down unto me, and bow
     down themselves unto me, saying, Get thee out, and all the
     people that {c} follow thee: and after that I will go out.
     And he went out from Pharaoh in a great anger.

     (c) That is, under the power and government.

Exodus 11:9
11:9 And the LORD said unto Moses, Pharaoh shall not hearken
     unto you; {d} that my wonders may be multiplied in the land
     of Egypt.

     (d) God hardens the hearts of the reprobate, that his glory
         by this might be set forth even more, Romans 9:17.