Commentaire sur L’Exode 8:28

Again this time. [Once more,] though he said, “I will send you out,” he did not keep his promise.

גם בפעם הזאת, just as G’d had stiffened Pharaoh’s heart after the relief experienced when the frogs had died, so that he had reneged on his promise.

גם בפעם הזאת, as he had done after the plague of the crocodiles had been removed. Seeing that the wild beasts had only retreated to their lairs and had not died, so that they still represented a potential threat, Pharaoh toughened his resolve and refused to send off the people.