פּירוש אויף שמות 7:27

“Your whole country with frogs” [7:27]. The Holy One said to Moses: Tell Pharaoh that because he will not allow Israel to leave, I will punish your land with frogs. Your house and rooms and your bed, by your nobles and slaves equally. So too, in your oven and in the dough that you bake for bread.

Bahya writes. The king of Egypt had a dispute with the king of Ethiopia. The king of Egypt said to the king of Ethiopia: you have taken away my land. The king of Ethiopia said the same. However, when the frogs came to the land of Egypt, they saw how far the land of Egypt extended. There were frogs in the whole land of Egypt up to the border of the land of Ethiopia. From then on, there was peace between the two kings.²¹Bahya, Exodus, 7:27.

ואם מאן אתה — AND IF THOU BE A REFUSER. מאן — The word has the same meaning as ממאן, refusing, (the Piel participle) only the difference is that it is a description of a person having reference to the action he always does (i. e. it is an adjective and the full phrase would be איש מאן) similar to שָׁלֵו “a man at ease” (Job 16:12); שָׁקֵט “a man at ease” (Jeremiah 48:11); וְזָעֵף [‎סר] “a man displeased” (1 Kings 20:43), whilst מְמאֵן merely describes the person as refusing at some particular moment.

נגף את כל גבולך I WILL PLAGUE ALL THY BOUNDARIES — נוגף means smiting. So, too, wherever a form from the root נגף occurs, it does not necessarily denote killing but it may mean merely smiting. Similarly, (Exodus 21:22) “and if they hurt (ונגפו) a woman with child”, does not mean they kill (as the context shows); so, too, (Jeremiah 13:16) “and before your feet stumble (יתנגפו)” (i. e. hit against something); (Psalms 91:12) “lest thou dash (תגף) thy foot against a stone”; (Isaiah 8:14) ”and for a stone of stumbling (נגף)‎”.