A serpent - This miracle had a meaning which Moses could not mistake. The serpent was probably the basilisk or Uraeus, the Cobra. This was t…

A serpent. — The word used here (nakhash) is a generic one for a snake of any kind and tells us nothing as to the species…

And he said, cast it on the ground
That is, the rod or staff: and he cast it on the ground, and it becam…

Moses objects that the people would not take his word unle he showed them some sign. God gives him power to work miracles.