If they will not believe also. "Even" would be a better translation than "also." The river is of course "the Nile." See the comment on Exodus 2:3. Of the three signs given, the first would probably convince all those who were religious, well-disposed, and fair-minded; the second, acting upon their fears, would move all but the desperately wicked, who despised Jehovah and put their trust in the gods of the Egyptians (Joshua 24:14; Ezekiel 20:7, Ezekiel 20:8; Ezekiel 23:3, Ezekiel 23:8, etc.
). The third sign was for these last, who would regard the Nile as a great divinity, and would see in the conversion of Nile water into blood a significant indication that the God who had commissioned Moses was greater than any Egyptian one.