Comentário sobre Êxodo 9:6

.כל מקנה מצרים, all the cattle of Egypt. This refers to the cattle the Egyptians had not brought indoors, this is why the words "in the field" are missing here.

Adonoy will do this thing. The Torah explains that Hashem alone brought these two plagues (wild animals and pestilence), and not through the agency of Moshe and Aharon. Since these plagues came to enlighten them about Divine Providence, Hashem clarified that He has no need for intermediaries, for He Himself watches over the world and accomplishes everything.

וימת כל מקנה מצרים, “all the domesticated livestock of Egypt died.” The Torah means to emphasize that all the livestock which died belonged to the Egyptians. The verse does not mean that all the livestock in Egypt died, as it states specifically in our verse that of the livestock owned by Israelites not a single animal died. This is why the Torah could write in verse 20 that the livestock of G-d fearing Egyptians who had brought their beasts into shelter did not die.