Exodus 7:19

Upon their streams, &c., both in vessels of wood and vessels of stone “To what purpose this minuteness?” says the last-mentioned author. “May not the meaning be that the water of the Nile should not only look red and nauseous, like blood, in the river, but in their vessels too, and that no method of purifying it should take place, but, whether drunk out of vessels of wood or out of vessels of stone, by means of which they were wont to purge the Nile water, it should be the same, and should appear like blood.” Harmer, vol. 2. p. 292.