13 And Pharaoh’s heart became hard, that he hearkened not unto them as the Lord had said.
14 Then the Lord said unto Moses, Pharaoh’s heart is become grievous, for he refuses to let the people go.
15 Go unto Pharaoh in the morning; behold, he goes out unto the water; and thou shalt stand by the river’s brink before him and take in thy hand the rod which was turned to a serpent
16 and say unto him, The Lord, the God of the Hebrews has sent me unto thee, saying, Let my people go, that they may serve me in the wilderness; and, behold, until now thou hast not desired to hear.
17 Thus hath the Lord said, In this thou shalt know that I am the Lord; behold, I will smite with the rod that is in my hand the waters which are in the river, and they shall be turned to blood.
18 And the fish that are in the river shall die, and the river shall stink; and the Egyptians shall loathe to drink the water of the river.
19 And the Lord spoke unto Moses, Say unto Aaron, Take thy rod and stretch out thine hand upon the waters of Egypt, upon their rivers, upon their streams, and upon their ponds, and upon all their pools of water, that they may become blood and that there may be blood throughout all the land of Egypt, both in vessels of wood and in vessels of stone.