9 And it shall come to pass, if they will not believe also these two signs, neither hearken unto your voice, that you shall take of the water of the river, and pour it upon the dry land: and the water which you take out of the river shall become blood upon the dry land.
Exodus 4:9 Cross References - KJ2000
Exodus 1:22
22 And Pharaoh charged all his people, saying, Every son that is born you shall cast into the river, and every daughter you shall save alive.
Exodus 7:19-25
19 And the LORD spoke unto Moses, Say unto Aaron, Take your rod, and stretch out your hand upon the waters of Egypt, upon their streams, upon their rivers, 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.
20 And Moses and Aaron did so, as the LORD commanded; and he lifted up the rod, and smote the waters that were in the river, in the sight of Pharaoh, and in the sight of his servants; and all the waters that were in the river were turned to blood.
21 And the fish that were in the river died; and the river stank, and the Egyptians could not drink of the water of the river; and there was blood throughout all the land of Egypt.
22 And the magicians of Egypt did so with their enchantments: and Pharaoh's heart was hardened, neither did he hearken unto them; as the LORD had said.
23 And Pharaoh turned and went into his house, neither did he lay to heart this also.
24 And all the Egyptians dug round about the river for water to drink; for they could not drink of the water of the river.
25 And seven days were fulfilled, after the LORD had smitten the river.
Matthew 7:2
2 For with what judgment you judge, you shall be judged: and with what measure you measure, it shall be measured to you again.