מדרש אויף תהילים 61:7

יָמִ֣ים עַל־יְמֵי־מֶ֣לֶךְ תּוֹסִ֑יף שְׁ֝נוֹתָ֗יו כְּמוֹ־דֹ֥ר וָדֹֽר׃

טעג צו די טעג פֿון דעם מלך זאָלסטו צולײגן, זײַנע יאָרן זאָלן זײַן װי אַ דָור אױף אַ דָור.

Pirkei DeRabbi Eliezer

"For thou, O Lord, hast made me glad through thy work" (Ps. 92:4). Adam said: The Holy One, blessed be He, had made me glad and brought me into the garden of Eden, and showed me the place of the abode of the righteous in the garden of Eden, and He showed me the four kingdoms, their rule and their destruction; and He showed me David, the son of Jesse, and his dominion in the future that is to come. I took from my years seventy years and added them to his days, as it is said, "Thou wilt add days to the days of the king; his years shall be as many generations" (Ps. 61:6). The Holy One, blessed be He, said to him: Thou wilt add days to the days of (the king Messiah); I also will add to his years in the future which is to come, as though they were many generations, as it is said, "His years shall be as many generations" (ibid.). I have given to God praise, and song (lauding) His works, as it is said, "I will sing of the works of thy hands" (Ps. 92:4).
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Aggadat Bereshit

[3] Another interpretation: "And Zion said, 'The Lord has forsaken me.' David said, 'I have considered the days of old, the years of ancient times. Have you forever rejected us? Will you be angry with us forever?' (Psalm 77:6-8). What did Zion mean when she said, 'The Lord has forsaken me'? She meant to say, 'I have considered all the days since creation and have not been redeemed. I considered the days of menstruation, as the prophet said, "Their way was like the uncleanness of menstruation before me" (Ezekiel 36:17). I considered the days of childbirth, as the prophet said, "Therefore, he will give them up until the time when she who is in labor bears a child" (Micah 5:2). I thought about the generations, as it is written "May his days be like those of a generation (Psalm 71:7)." I thought that twenty years had passed since Isaac desired to have children, as it says "Isaac was forty years old when he took Rebekah... (Genesis 25:20)," and he had a son at the age of sixty, as it says "Isaac was sixty years old when they were born (Genesis 25:26)." I thought and was not redeemed. I thought that twenty-two years had passed for Jacob, corresponding to the twenty-two years that Joseph was separated from him [his father], and after twenty-two years he was reunited with him, as it says "Joseph is still alive (Genesis 45:28)." I thought and was not redeemed. I thought that Babylonian rule lasted for seventy years, as it says "When Babylon reaches seventy years (Jeremiah 29:10)," and I thought that the rule of Media and Greece would also end, but I was not redeemed. For many years, Aram enslaved me, and I was not redeemed. Has God forgotten how to pity? (Psalm 77:10), or perhaps "Has His faithfulness disappeared forever?" (Psalm 77:9). Therefore, I say, "God has abandoned me." (Isaiah 49:14)
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Midrash Tehillim

"It is good to give thanks to God," as said by Adam, the first man. So that all generations will learn that anyone who confesses his sins and abandons them is saved from the hellish state, as it is said, "It is good to give thanks to God." To say in the morning, "Your kindness extends to all who exist in the next world, that they are similar to the morning, and your faith extends to all who exist in this world, that they are similar to the night." They will say and proclaim, "His faith and kindness saved me from the hellish state, on me for a decade." All testimonies are given with ten people: the harp that David played was played with ten, testimony of a dead person is given with ten, circumcision is done with ten, the blessing of God's name is given with ten, and the testimony of the redemption of a property is given with ten, as it is said, "And Boaz took ten men." The Holy One, Blessed be He, said, "I do not want a song with a harp from Israel, but rather the meditation of their lips," as it is said, "My meditation on Him shall be sweet." Rabbi Hezekiah, the son of Rabbi Jeremiah, said, "There was an incident with one of the disciples of Rabbi Shimon ben Yochai who went to Hadakai and returned rich. When he came to Rabbi Shimon ben Yochai, the students saw his wealth and envied themselves. What did Rabbi Shimon ben Yochai do? He went with them to a certain valley and said, "Valley, valley, fill with gold coins," and it was filled. Immediately, he said to his students, "Each and every one of you may take as much as you want, but know that whoever takes from his share of the reward of the world to come, takes away." Once they heard this, they withdrew their hands and began to say, "My happiness is in your deeds, O Lord." A person should say, "May the Lord make me happy and bring me into the Garden of Eden, and show me the place of the righteous in the Garden of Eden, and show me the four kingdoms that are ruled and lost, and show me the son of Jesse who will rule in the future, and I will add seventy years to my life, as it says, "May He add days upon days."
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