refuse: Exodus 7:14, Exodus 9:2
frogs: The Hebrew tzephardêim: is evidently the same with the Arabic zafda:, Chaldaic oordeânaya:, and Syriac oordeai:, all of which denote frogs, as almost all interpreters, both ancient and modern, agree to render it; Bochart conceives, from tzifa:, a bank, and rada:, mud, because of delighting in muddy and marshy places. Psalms 78:45, Psalms 105:30; Revelation 16:13-14