Midrash sur L’Exode 15:20

And his sister stood from afar... - Why did Miriam stand from afar? Rabbi Amram said in the name of Rav: Because Miriam prophesied and said "In the future, Mother will give birth to a child that will be the savior of the Jewish people." When Moshe was born, the entire house was filled with light. [Miriam's] father arose and kissed her on the head. He [Amram] said to her [Miriam]: "My daughter, your prophecy has been fulfilled". That is what is said (Exodus 15:20) "And Miriam the Prophetess, the brother of Aharon, took the tambourine..." Was she only the brother of Aharon and not the brother of Moshe? Rather, she had stated that prophecy while she was the sister of Aharon and not (yet) the sister of Moshe. When they put him (Moshe) in the river, her mother arose and hit her on the head and said to her daughter: "My daughter, where is your prophecy!?" And this is why the verse says "And his sister stood by from afar", for she wanted to know what would be the results of her prophecy. And the Rabbis say the entire verse was said with the Divine Spirit. "And she stood" similar to (Samuel I 3:10) "And G-D came and stood". "His Sister" similar to (Proverbs 7:4) "Say to wisdom, she is your sister". "From afar" similar to (Jeremiah 31:2) "From afar G-D is seen to me". "To know what will happen to him" similar to (Samuel I 2:3) "For G-D is all knowing".

"And his sister stood back" - Why did Miriam stand back? Rabbi Amram said in the name of Rav: "Because Miriam had prophesied: 'In the future, my mother will give birth to a son who will save Israel'. When Moses was born, the whole house was filled with light; her father rose and kissed her on the head. He said to her: 'My daughter! Your prophecy has come to pass' - as it is written [Exodus 15:20]: 'And Miriam the prophetess, sister of Aaron, took up the timbrel.' [Why was she called] 'Sister of Aaron,' and not 'sister of Moses'?! Because when she issued her prophecy, she was [only] the sister of Aaron - Moses had not been born yet. When she cast him into the Nile, her mother rose and struck her on the head. She said: 'My daughter! What has become of your prophecy?!' This is why it is written 'his sister stood back etc.': in order to know would become of her prophecy. And our rabbis taught: This entire verse speaks [not of Miriam, but] of the Holy Spirit. 'And she stood...' refers to 'The LORD came and stood...' [I Samuel 3:10]; '[His] sister' refers to 'Say to Wisdom: "You are my sister"' [Proberbs 7:4]. 'Back' refers to 'The Lord appeared to me from far back' [Jeremiah 31:3]. 'In order to know what would happen to him' refers to 'For the LORD is a God of knowledge.' [I Samuel 2:3]".

“The blossoms have appeared in the land, the time of the nightingale has arrived, and the sound of the turtledove is heard in our land” (Song of Songs 2:12).
“The blossoms [hanitzanim] have appeared in the land,” the administrators [hanatzoḥot] have appeared in the land; these are Moses and Aaron, as it is stated: “The Lord said to Moses and Aaron in the land of Egypt, saying” (Exodus 12:1).¹¹⁰This is the month of redemption and they would be the leaders who facilitate that redemption.
“The time of the nightingale [hazamir] has arrived,” the time for Israel to be redeemed has arrived, the time for the foreskin to be cut off [shetizamer] has arrived, the time for Egypt to be cut off has arrived, the time for their idol worship to be uprooted has arrived, as it is stated: “And I will administer punishments against all the gods of Egypt” (Exodus 12:12). The time for the sea to have its water split has arrived, as it is stated: “The water split” (Exodus 14:21). The time for song has arrived, as it is stated: “Then Moses…sang” (Exodus 15:1). Rabbi Tanḥuma said: The time to compose paeans to the Holy One blessed be He has arrived, as it is stated: “The Lord is my strength and my song [vezimrat ya]” (Exodus 15:2); paeans to the Lord [zemirot ya]. Rabbi Beivai said: “Your statutes were paeans to me” (Psalms 119:54). ”The sound of the turtledove [hator] is heard in our land,” Rabbi Yoḥanan said: The voice of a good explorer [tayar] was heard in our land; this is Moses, at the time that he said: “Moses said: So said the Lord: At about midnight” (Exodus 11:4).

(Ibid. 20) "Then Miriam the prophetess took": Where do we find that Miriam was a prophetess? She said to her father (Amram): In the end, you will beget a son who will be the savior of Israel from Egypt — (Ibid. 2:1) "And there went a man (Amram) from the house of Levi and took the daughter of Levi, (Yocheved — after he had separated from her because of Pharaoh's decree to drown the males) (2) "And she conceived and bore a son … (3) and could conceal him no longer…" — whereupon her father rebuked her, saying: My daughter, where is your prophecy? But she stood fast to her prophecy, viz. (4) "And his sister stood from afar to know what would be done with him," "standing" ("yetzivah") signifying prophecy, viz. (Amos 9:1) "I saw the L rd standing on the altar", and (I Samuel 3:10) "And the L rd came and He stood, etc.", and (Devarim 31:14) "Call Joshua and stand, etc." (Exodus, Ibid.) "from afar": "from afar" everywhere signifies the Holy Spirit, viz. (Jeremiah 31:2) "From afar the L rd appeared to me." (Exodus, Ibid.) "to know": "Knowing" signifies the Holy Spirit, viz. (Isaiah 11:9) "for the earth will be filled with knowing of the L rd, etc." (Exodus, Ibid.) "what would be done with him": "Doing signifies the Holy Spirit, viz. (Amos 3:7) "For the L rd G d will not do a thing unless He has revealed His secret to His servants the prophets." (Exodus 15:20) "Then Miriam the prophetess, the sister of Aaron": Was she not (also) the sister of Moses? Why, then, "the sister of Aaron"? __ Because Aaron risked his life for his sister (viz. Numbers 12:2), she was called by his name. Similarly, (Genesis 34:25) "Shimon and Levi, the brothers of Dinah." Now was she not the sister of all of the tribes? Why, then, "the brothers of Dinah"? __ Because they risked their lives for her, she was called their sister. Similarly, (Numbers 25:18) "Kazbi, the daughter of a prince of Midian, their sister." Now was she their (Midian's) sister? Was he (Tzur, her father,) not "the head of the peoples of a father's house in Midian" (viz. (Numbers 25:15)? Why, then, "their (Midian's) sister'? __ Because she risked her life for her people, they were called by her name.