Exodus 4:30

Aaron spake all the words - It is likely that Aaron was better acquainted with the Hebrew tongue than his brother, and on this account he became the spokesman. See Clarke on Exodus 4:14 ; (note).

Did the signs - Turned the rod into a serpent, made the hand leprous, and changed the water into blood. See Clarke on Exodus 4:6 ; (note) and Exodus 4:8 ; (note).