The Lord vs. Pharoah

Then the Lord said to Moses,
"Go to Pharaoh,
for I have hardened his heart
and the hearts of his officials
that I may perform
these miraculous signs of Mine among them
that you may tell your children and grandchildren
how I dealt harshly with the Egyptians
and how I performed My signs among them,
and that you may know
that I am the Lord."

So Moses and Aaron went to Pharaoh
and said to him,
"This is what the Lord,
the God of the Hebrews, says:
'How long will you refuse to humble yourself before Me?
Let My people go,
so that they may worship Me.'"

(Exodus 10:1-3)