פּירוש אויף שמות 14:13

כי אשר ראיתם את מצרים וגו׳ means WHAT (the fact that) YE HAVE SEEN them (THE EGYPTIANS), is only היום THIS DAY — to-day it it that ye see them, BUT YE SHALL NEVER AGAIN see them.

FOR WHEREAS YE HAVE SEEN THE EGYPTIANS TODAY, YE SHALL SEE THEM AGAIN NO MORE. In the opinion of our Rabbis,⁴⁷Yerushalmi Succah V, 1. See Maimonides’ “The Commandments,” Vol. II, pp. 44-46, in my translation. this is a negative commandment for all times. If so, Scripture is stating: “Fear ye not, stand still in your places, and see the salvation of the Eternal in that He will save you today from their hands. Concerning the Egyptians you see today, G-d commands you to see them no more of your own free will henceforth and for ever.” It is thus a commandment by the mouth of Moses to Israel, even though it is not mentioned above [that G-d had said so to Moses]. Similarly, the verse, And he [the king] shall not cause the people to return to Egypt, to the end that he should multiply horses; forasmuch as the Eternal hath said unto you: Ye shall henceforth return no more that way,⁴⁸Deuteronomy 17:16. indeed constitutes a commandment, not just a promise.

Stand and see the deliverance of the Lord: Since you will not make war on Egypt. Rather you will see the deliverance of the Lord that He will do for you today. One may wonder how [such] a large camp of six hundred thousand men would be afraid of those pursing after them. And why did they not fight for their lives and for their children? The answer is that the Egyptians were the Israelites' masters. And [so] this generation that went out of Egypt learned from its youth to tolerate the yoke of Egypt and had a lowly image. And [so] how could they now battle with their masters? And Israel was [also] indolent and not trained in warfare. Do you not see that Amalek came with [only] a small group and were it not for the prayer of Moshe, they would have overpowered Israel. And the only God, 'who does great things' and 'for whom all plots are contemplated,' caused that all the males of the people that went out of Egypt would die. As there was no strength in them to fight against the Canaanites, until a new generation, after the generation of the desert, arose. And they did not see exile and they had a [confident] spirit, as I mentioned in the words about Moshe in the Parsha of Eleh Shemot (Ibn Ezra on Exodus 2:3).