Commentaries:
Barnes' Notes
Thy rod - Apparently the rod before described Exodus 4:2, which Moses on this occasion gives to Aaron as his representative.
A serpent - A word different from that in Exodus 4:3. Here a more general term, tannı̂yn , is employed, which in other passages includes all sea or river monsters, and is more specially applied to the crocodile as a symbol of Egypt. It occurs in the Egyptian ritual, nearly in the same form, "Tanem," as a synonym of the monster serpent which represents the principle of antagonism to light and life.
Other Barnes' Notes entries containing Exodus 7:9:
Psalms 91:13
Isaiah 13:22
Acts 2:19
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