Exodus 7:21 - Exposition

The fish that was in the river died . It is most natural to understand "all the fish." There was blood, etc. Literally, "and the blood was throughout all the land of Egypt." The exact intention of the phrase is doubtful, since undoubtedly "in numberless instances, the Hebrew terms which imply universality must be understood in a limited sense (Cook). "All the land" may mean no more than "all the Delta."