Jeremías 31:10 Midrash: Midrash Tehillim & Bereshit Rabbah

Another thing in you, O Lord, I have taken refuge. As it says (Isaiah 45:17), "Israel shall be saved by the Lord." The children of Israel said before the Holy One, Blessed be He, "Every day that we are enslaved, we are ashamed. But our redemption will not cause us shame, for your redemption is the redemption of the world. You are the salvation of the world." The term "world" is used, not "worlds." The Holy One, Blessed be He, said, "I am the one who redeemed you, and I am the one who will redeem you, as it is said (Isaiah 43:1), 'Fear not, for I have redeemed you.' It is written not 'I have redeemed you' but 'I have redeemed you.' I have spoken and done it. The Holy One, Blessed be He, said, "I have said that I will redeem you as I have redeemed you before." As it is written (Jeremiah 31:10), "For the Lord has ransomed Jacob and redeemed him from the hands of his conqueror." It is not written here 'him' but 'his redeemer.' The children of Israel said before Him, "We have already been redeemed by Moses, and likewise by Joshua, and also by the judges and kings, and yet we are still subject to servitude and we are ashamed as if we were never redeemed." The Holy One, Blessed be He, said to them, "In the past, your redemption was by human agents, but now it is by Me alone, for I am alive and will exist forever. Therefore, your redemption is the redemption of the world." As it is said (Isaiah 45:17), "Israel shall be saved by the Lord, the salvation of the world." Therefore, you shall not be ashamed or disgraced forever. The Holy One, Blessed be He, said to them, "When you were young, you had the strength to be ashamed, but now that you are old and do not have the strength, you shall not be ashamed or disgraced." David, our Master, said that when the redemption comes, we will not be ashamed, as it is said, "In you, O Lord, I have taken refuge. Let me never be put to shame." (Psalm 71:1)...

“On that day, the Lord established a covenant with Abram, saying” – Rabbi Yudan [said]: Rabban Yoḥanan ben Zakkai and Rabbi Akiva, one said: He told him about this world⁹⁸The events that would take place through history, namely, the subjugation of the Four Kingdoms. but He did not tell him about the World to Come. Another said: He told him about this world and the World to Come.
Rabbi Berekhya, saying [in the name of] Rabbi Elazar, and Rabbi Yosei bar Ḥanina, one said: He told him about [the events] until this day.⁹⁹Until the day mentioned in this passage – the exodus from Egypt. The other said: He told him about [the events] until that day.¹⁰⁰The day of the messianic redemption, as it is written “on that day the Lord will be one and His name one” (Zechariah 14:9).
“To your descendants I have given…” – Rav Huna and Rabbi Dostai in the name of Rabbi Shmuel bar Naḥman: Even a mere statement by the Holy One blessed be He, too, is considered like an act,¹⁰¹Once God states that something will occur, it is as if it has already taken place in actuality. as it is stated: “To your descendants I have given.” “I will give this land” is not written here, but rather, “I have given this land.” Rabbi Yudan said in the name of Rabbi Abba bar Kahana: “Let those whom the Lord has redeemed say” (Psalms 107:2). “Those whom He redeems” is not stated, but rather, “those whom [the Lord] has redeemed.” Rabbi Avun said: “For the Lord is redeeming Jacob” is not written here, but rather, “for the Lord has redeemed Jacob” (Jeremiah 31:11). The Rabbis say: “I will whistle to them and gather them” (Zechariah 10:8), “for I will redeem them” is not written here, but rather, “for I have redeemed them” (Zechariah 10:8). Rabbi Yehoshua said: “The Lord will create over every structure of Mount Zion” is not written here, but rather, “He has created” (Isaiah 4:5) – it is [as if it is] already created and ready.