Tanach · Rishonim on Tanach · Sforno · Torah
Sforno on Exodus 8:14/ספורנו על שמות ח׳:י״ד
אוְלֹא יָכֹלוּ. מִבְּלִי אֵין לְאֵל יָדָם לְהַמְצִיא דָּבָר מִתְנוֹעֵעַ בֶּאֱמֶת.
1ולא יכולו. They were unable to produce anything which could truly move on its own.