Exodus 7:15
The First Plague: Nile River Turned to Blood

Get thee unto Pharaoh in the morning; lo, he goeth out unto the water; and thou shalt stand by the river's brink against he come; and the rod which was turned to a serpent shalt thou take in thine hand.
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Exodus 7:14
And the LORD said unto Moses, Pharaoh's heart is hardened, he refuseth to let the people go.
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Exodus 7:16
And thou shalt say unto him, The LORD God of the Hebrews hath sent me unto thee, saying, Let my people go, that they may serve me in the wilderness: and, behold, hitherto thou wouldest not hear.