New Revised Standard Version
Thus says the LORD, “By this you shall know that I am the LORD.” See, with the staff that is in my hand I will strike the water that is in the Nile, and it shall be turned to blood.

Contemporary English Version
"The LORD is going to do something to show you that he really is the LORD. I will strike the Nile with this stick, and the water will turn into blood.

New American Bible
Thus says the LORD: This is how you will know that I am the LORD. With the staff here in my hand, I will strike the water in the Nile and it will be changed into blood.

Douay-Rheims Bible
Thus therefore saith the Lord: In this thou shalt know that I am the Lord: behold I will strike with the rod, that is in my hand, the water of the river, and it shall be turned into blood.

Thus therefore saith the Lord: In this thou shalt know that I am the Lord: behold I will strike with the rod, that is in my hand, the water of the river, and it shall be turned into blood.

thou shalt

Exodus 7:5 And the Egyptians shall know that I am the Lord, who have stretched forth my hand upon Egypt, and have brought forth the children of Israel out of the midst of them.

Exodus 5:2 But he answered: Who is the Lord, that I should hear his voice, and let Israel go? I know not the Lord, neither will I let Israel go.

Exodus 6:7 And I will take you to myself for my people, I will be your God: and you shall know that I am the Lord your God, who brought you out from the work-prison of the Egyptians:

1 Samuel 17:46,47 This day, and the Lord will deliver thee into my hand, and I will slay thee, and take away thy head from thee: and I will give the carcasses of the army of the Philistines this day to the birds of the air, and to the beasts of the earth: that all the earth may know that there is a God in Israel. . . .

1 Kings 20:28 (And a man of God coming, said to the king of Israel: Thus saith the Lord: Because the Syrians have said: The Lord is God of the hills, but is not God of the valleys: I will deliver all this great multitude into thy hand, and you shall know that I am the Lord.)

2 Kings 19:19 Now therefore, O Lord our God, save us from his hand, that all the kingdoms of the earth may know that thou art the Lord, the only God.

Psalm 9:16 The Lord shall be known when he executeth judgments: the sinner hath been caught in the works of his own hands.

Psalm 83:18 And let them know that the Lord is thy name: thou alone art the most High over all the earth.

Ezekiel 29:9 And the land of Egypt shall become a desert, and a wilderness: and they shall know that I am the Lord, because thou hast said: The river is mine, and I made it.

Ezekiel 30:8,19 And they shall know that I am the Lord: when I shall have set a fire in Egypt, and all the helpers thereof shall be destroyed. . . .

Ezekiel 32:15 When I shall have made the land of Egypt desolate: and the land shall be destitute of her fulness, when I shall have struck all the inhabitants thereof and they shall know that I am the Lord.

Ezekiel 38:23 And I will be magnified, and I will be sanctified: and I will be known in the eyes of many nations and they shall know that I am the Lord.

Ezekiel 39:28 And they shall know that I am the Lord their God, because I caused them to be carried away among the nations; and I have gathered them together unto their own land, and have not left any of them there.

Daniel 4:17,32,37 The tree which thou sawest, which was high and strong, whose height reached to the skies, and the sight thereof into all the earth: . . .

Daniel 5:21,23 And he was driven out from the sons of men, and his heart was made like the beasts, and his dwelling was with the wild asses, and he did eat grass like an ox, and his body was wet with the dew of heaven: till he knew that the most High ruled in the kingdom of men, and that he will set over it whomsoever it shall please him. . . .

and they

Exodus 1:22 Pharao therefore charged all his people, saying: Whatsoever shall be born of the male sex, ye shall cast into the river: whatsoever of the female, ye shall save alive.

Exodus 4:9 But if they will not even believe these two signs, nor hear thy voice: take of the river water, and pour it out upon the dry land, and whatsoever thou drawest out of the river, shall be turned into blood.

Psalm 78:44 And he turned their rivers into blood, and their showers that they might not drink.

Psalm 105:29 He turned their waters into blood, and destroyed their fish.

Revelation 8:8 And the second angel sounded the trumpet: and, as it were, a great mountain, burning with fire, was cast into the sea. And the third part of the sea became blood.

Revelation 16:3-6 And the second angel poured out his vial upon the sea. And there came blood as it were of a dead man: and every living soul died in the sea. . . .