(1) Then Moses and the Israelites sang this song to יהוה. They said:
I will sing to יהוה, for He has triumphed gloriously;
Horse and driver He has hurled into the sea. (2) יהוה is my strength and might;
He is become my deliverance.
This is my God and I will enshrine Him;
The God of my father’s [house], and I will exalt Him.
(3) יהוה, the Warrior—
יהוה is His name!
(4) Pharaoh’s chariots and his army
He has cast into the sea;
And the pick of his officers
Are drowned in the Sea of Reeds.
(5) The deeps covered them;
They went down into the depths like a stone.
(6) Your right hand, יהוה, glorious in power,
Your right hand, יהוה, shatters the foe!
(7) In Your great triumph You break Your opponents;
You send forth Your fury, it consumes them like straw.
(15) I will show him wondrous deeds
As in the days when You sallied forth from the land of Egypt.
אין לך כל נסים ונפלאות שעשה הקב"ה לישראל במצרים, שאין עתיד לעשות כן לציון ולירושלים
Midrash Tanchuma (Bo 13):
There is no miracle and wonder that the Holy One did for Israel in Egypt that He will not also do for Zion and Jerusalem [in the future].
"אָז יָשִׁיר מֹשֶׁה – רבי עקיבא אומר: מיכן לתחיית המתים מן התורה. כעניין שנאמר: ‘אָז יָשִׁיר יִשְׂרָאֵל’ (במדבר כא:יז)...
לא נאמר 'שָׁר' אלא 'יָשִׁיר', מכאן לתחיית המתים מן התורה.
רבי נחמיה אומר: אין צריך, הרי הוא אומר: ‘שירו לה׳ שיר חדש’ (תהילים צ"ח:א), שירה לעתיד לבוא."
Mechilta de-Rabbi Yishmael, Shirata 1:
"Then Moses will sing – Rabbi Akiva says: This is a proof for the resurrection of the dead from the Torah. Just as it says, 'Then Israel will sing' (Numbers 21:17)...
It does not say 'sang' (past tense), but 'will sing' (future tense); hence, a hint to resurrection.
Rabbi Nechemiah says: That’s not necessary [as proof], for Scripture explicitly says, 'Sing to the Lord a new song' (Psalms 98:1) – a song for the future to come."
ביום האחרון של פסח מאיר אור הגאולה העתידה
Sha’ar HaKavanot (Inyan Pesach):
On the last day of Pesach, the light of the future redemption shines…
ביום האחרון של פסח מתגלה אורו של משיח... לכן אוכלים סעודת משיח ביום זה
Baal Sbem Tov:
On the last day of Pesach, the light of Mashiach is revealed… therefore we eat the Seudat Mashiach on this day.