What is a Miracle?

Another interpretation: “This month shall be for you” (Exodus 12:2) – that is what is written: “You shall say to Pharaoh: So said the Lord: Israel is My firstborn son. I have said to you: Let My son go, and he will serve Me; and you have refused to let him go. Behold, I will kill your firstborn son.” (Exodus 4:22–23). May the name of the Holy One blessed be He be exalted, as He “declares the end from the beginning” (Isaiah 46:10). Regarding Abraham it says: “Also that nation, whom they will serve, I will judge [dan]” (Genesis 15:14). What is dan? The plague of the firstborn, which is called an affliction [nega], as it is stated: “One further affliction [nega] [will I bring upon Pharaoh and Egypt; afterward he will send you forth from this]” (Exodus 11:1). What is: “I [anokhi] will judge?” The Holy One blessed be He said: “I will exact retribution from them with the plague of the firstborn, as it is stated: “Behold, I [anokhi] will kill your firstborn son.” The Holy One blessed be He passed this sign to Abraham, and Abraham to Isaac, Isaac to Jacob, Jacob to Levi, Levi to Kehat, Kehat to Amram, and Amram to Moses. Moses kept it as he proceeded. What is: “Israel is My firstborn son?” Rabbi Ḥiyya said: Sons whose fathers blessed them with their actions. That is Abraham as it is stated: “Blessed is Abram to God the Most High” (Genesis 14:19). Alternatively: “Israel is My firstborn son” – sons of he who took the birthright. Alternatively: “Israel is My firstborn son” – the Holy One blessed be He said to the wicked Pharaoh: ‘Do you not know how much I value the firstborn, as I wrote in My Torah: “Do not work your firstborn ox” (Deuteronomy 15:19). Anyone who works it is beaten, and you extended your hand against My firstborn; justice demands that you will be beaten.’
The Holy One blessed be He brought ten plagues upon him corresponding to the ten trials with which Abraham was tested and he withstood them all. He brought them through Moses and through Aaron and by Himself. This is analogous to a king against whom ten provinces rebelled. He took with him two generals and went and conquered them. The king said: If I record them [the victories] in my name, how can I accord them honor? If I record them in their names, I exclude myself. Rather, I will divide them into three, and there is one extra, and I will divide it among the three of us. Thus, the plague of boils was performed by the three of them. What does it say regarding the boils: “Upon the magicians [baḥartumim]” (Exodus 9:11), is defective, meaning that it afflicted their angel on high, so they would have no ability to resist.
He brought ten plagues upon them like a military campaign. The frogs were especially hard on them, as it is stated: “Frogs that destroyed them” (Psalms 78:45), as they wounded their bodies and castrated them [the Egyptians], as it is stated: “And into your bedchamber, and onto your bed” (Exodus 7:28). The frogs said to them: ‘The image of their God is nullified, and yours [your ability to procreate] remains intact?’ Therefore: “That destroyed them [vatashḥitem],” as it says: “And he spilled it [veshiḥet] on the ground” (Genesis 38:9). From where [is the proof] that they [the frogs] spoke [medabberot]: “Regarding [al devar] the frogs that He had brought upon Pharaoh” (Exodus 8:8).
Moreover, He brought upon them the plague of wild beasts [arov], because they were all intermingled [me’urbavin]; one man consorted with ten women, and ten men consorted with one woman; therefore, He brought a mixture [irbuvya] upon them.
When the Holy One blessed be He said to Moses: “One further affliction [nega] will I bring upon Pharaoh” (Exodus 11:1), Moses said: The sign has arrived [higia]. “One was Abraham” (Ezekiel 33:24) – behold, it is the affliction of the “one”. Since they [Israel] were firstborn, He therefore killed the firstborn, as it is stated: “Behold, I will kill your firstborn son” (Exodus 4:23). That is the sign to Abraham: “I will judge” (Genesis 15:14)
Another matter: Why is Israel called “My firstborn son”? Because it is written in the Torah: “Rather, he shall acknowledge the firstborn son of the hated, giving him a double portion” (Deuteronomy 21:17); so too, Israel inherits two worlds, this world and the World to Come. That is why the Holy One blessed be He gave the secret of [calculating the waxing and waning of] the moon to Israel, that they should count on its basis, but the idolaters count on the basis of the sun; that is to say, just as the sun rules only during the day, so too, they rule only in this world, and just as the sun is made of fire, so, they are destined to be punished in it, as it is stated: “Behold, the day is coming, burning like a furnace” (Malachi 3:19). And just as the moon is seen during the day and at night, so, Israel rules in this world and in the World to Come. And just as the moon is made of light, so, Israel inherits the light, as it is stated: “Light is sown for the righteous” (Psalms 97:11), and it says: “Arise, shine, for your light has arrived” (Isaiah 60:1). That is why it says: “This month shall be for you” (Exodus 12:2) – it shall be yours, because you are of the same type [as the moon].

בני בכרי [ISRAEL IS] MY SON, MY FIRSTBORN — The term בכור “firstborn” denotes high dignity as, (Psalms 89:28) “I also will appoint him a בכור” (which is explained by the following words, “the highest of the kings of the earth”). This is the literal meaning; a Midrashic comment is: Here (in these words) the Holy One, blessed be He, set His seal to the sale of the birthright which Jacob had purchased from Esau (Genesis Rabbah 63:14).