Parallel
Exodus 4:9
Brenton's English Septuagint · Berean Standard Bible
And it shall come to pass if they will not believe thee for these two signs, and will not hearken to thy voice, that thou shalt take of the water of the river and pour it upon the dry land, and the water which thou shalt take from the river shall be blood upon the dry land.
But if they do not believe even these two signs or listen to your voice, take some water from the Nile and pour it on the dry ground. Then the water you take from the Nile will become blood on the ground.”