Exodus 7:17-19

Young's Literal Translation

¹⁷ `Thus said Jehovah: By this thou knowest that I [am] Jehovah; lo, I am smiting with the rod which [is] in my hand, on the waters which [are] in the River, and they have been turned to blood,

¹⁸ and the fish that [are] in the River die, and the River hath stank, and the Egyptians have been wearied of drinking waters from the River.'

¹⁹ And Jehovah saith unto Moses, `Say unto Aaron, Take thy rod, and stretch out thy hand against the waters of Egypt, against their streams, against their rivers, and against their ponds, and against all their collections of waters; and they are blood -- and there hath been blood in all the land of Egypt, both in [vessels of] wood, and in [those of] stone.'