Midrash sa Isaias 11:15: Kohelet Rabbah & Midrash Tehillim

“Vanity of vanities, said Kohelet; vanity of vanities, everything is vanity” (Ecclesiastes 1:2).
“Vanity of vanities [havel havalim]” – Rabbi Huna said in the name of Rabbi Aḥa: David made a statement and did not explain it, but his son Solomon explained it. Solomon made a statement and did not explain it, but his father David explained it. David said: “Man is like hevel” (Psalms 144:4); to what hevel [is man compared]? If it is to the hevel [heat] of an oven, it has significance. If it is to the hevel of a stove, it has significance. His son Solomon came and explained: “Vanity of vanities [havel havalim], said Kohelet.” Rabbi Shmuel bar Naḥmani taught it in the name of Rabbi Yehoshua ben Korḥa: It is comparable to a person who places seven pots on the fire one atop the other, and the heat of the upper one is insignificant.⁹This comparison is based on the fact that the term vanity [hevel] appears five times in Ecclesiastes 1:2, and twice it appears in the plural, for a total of seven mentions of the term hevel.
Solomon said: “For who knows what is good for man in his life, [all the days of his vain life,] that he spends like a shadow” (Ecclesiastes 6:12). What shadow? If it is like the shadow of a wall, it has substance. If it is like the shadow of a palm tree, it has substance. David came and explained: “His days are like a passing shadow” (Psalms 144:4). Rabbi Huna [said] in the name of Rav Aḥa: Like that bird that passes and its shadow passes with it. Shmuel said: Like the shadow of bees that have no substance at all.
Rabbi Shmuel bar Rav Yitzḥak taught it in the name of Rabbi Shimon ben Elazar: The seven vanities [havalim] that Kohelet mentioned correspond to the seven worlds that a person sees. A one-year-old is like a king who is on a canopied litter and everyone is hugging and kissing him. A two- or three-year-old is like a pig that extends its hands into the sewers. A ten-year-old jumps like a goat. A twenty-year-old whinnies like a horse, beautifies himself and seeks a wife. When he marries a wife he is like a donkey. When he begets children, he is as audacious as a dog to bring [home] bread andfood. When he grows old, he is like a monkey. That is stated regarding the common people; however, regarding Torah personalities, it is written: “King David was old” – even though he was old, he was a king.
Rabbi Yehuda ben Rabbi Simon said: The seven vanities that Kohelet mentioned correspond to the seven days of Creation. On the first, “In the beginning God created the heavens and the earth” (Genesis 1:1), and it is written: “For the heavens will vanish like smoke” (Isaiah 51:6). On the second: “Let there be a firmament” (Genesis 1:6), and it is written: “The heavens will be furled like a scroll” (Isaiah 34:4). On the third: “Let the waters be gathered” (Genesis 1:9), and it is written: “The Lord will destroy the tongue of the sea of Egypt” (Isaiah 11:15). On the fourth: “Let there be lights” (Genesis 1:14), and it is written: “The moon will be disgraced” (Isaiah 24:23). On the fifth: “Let the waters swarm [with swarms of living creatures, and let fowl fly above the earth in the open firmament of heaven]” (Genesis 1:20), and it is written: “I will destroy the birds of the heavens” (Zephaniah 1:3). On the sixth: “Let us make man” (Genesis 1:26), and it is written: “I will destroy man and animal” (Zephaniah 1:3). Regarding Shabbat, what do you have to say? “One who profanes it will be put to death” (Exodus 31:14). That is stated regarding one who does so intentionally; but [one who profanes it] unwittingly, he will bring an offering and gain atonement. When Adam saw the praise of Shabbat, that one who brings an offering gains atonement, he began singing in its regard to the Holy One blessed be He, praise and psalm. That is what is written: “A psalm, a song for the day of Shabbat” (Psalms 92:1). Rabbi Levi said: This [psalm] was stated by Adam.

A Psalm, a song for the Sabbath day. Rabbi Yitzchak said (Exodus 16:29), "See that the Lord has given you the Sabbath." What is meant by "see"? Rabbi Yosei of Marganita said, "[It means] it was given to you." Rabbi Yitzchak said, "Every engagement of the Sabbath is doubled." The omer offering is doubled (Leviticus 23:16), [combining] the two omer offerings into one. Its sacrifice is doubled (Numbers 28:9), with two lambs offered on the Sabbath day. Its punishment is doubled (Exodus 31:14), one who violates it shall surely be put to death. Its reward is doubled (Isaiah 58:13), "And you shall call the Sabbath a delight, the holy [day] of the Lord honored." Its warnings are doubled, "Remember" and "Keep." Its Psalm is doubled, "A Psalm, a song for the Sabbath day." This is what the verse means when it says (Ecclesiastes 1:2), "Vanity of vanities," said Kohelet, "Vanity of vanities; all is vanity." Kohelet said there are seven vanities. One vanity is [the fact] that the seven days of Creation correspond to it. Solomon said, "What was created on the first day? The heavens and the earth. And what will be their end? 'The heavens will vanish like smoke, and the earth will wear out like a garment' (Isaiah 51:6)." [This is] vanity. [He said,] "And what was created on the second day? The firmament. And what will be its end? 'And the heavens will be rolled up like a scroll' (Isaiah 34:4)." [This is] vanity. [He said,] "And what was created on the third day? The gathering of the waters. And what will be their end? 'And the Lord will utterly destroy the tongue of the Egyptian sea' (Isaiah 11:15)." [This is] vanity. [He said,] "And what was created on the fourth day? The luminaries. As it is said (Genesis 1:17), 'And God set them in the firmament of the heaven.' And what will be their end? 'And the moon will be confounded' (Isaiah 24:23)." [This is] vanity. [He said,] And what was created on the fifth day? "Let the waters swarm with swarms of living creatures" (Genesis 1:20). And what is their end? "I will utterly sweep away everything from the face of the earth" (Zephaniah 1:2). Says the Preacher, "Vanity of vanities!" (Ecclesiastes 1:2). And what was created on the sixth day? Man. And what is his end? "For you are dust, and to dust you shall return" (Genesis 3:19). Says the Preacher, "Vanity of vanities!" And what was created on the seventh day, the Sabbath? He looked around to see if there was any flaw in it, but found it all holy and serene. Rabbi Isaac said that afterwards he saw that man sinned on it and was held accountable, and he also said, "This too is vanity." Thus, all seven days are considered vanity. As it says, "Then I considered all that my hands had done and the toil I had expended in doing it, and behold, all was vanity and a striving after wind" (Ecclesiastes 2:11). The reason why all seven days are considered vanity is that on the seventh day, which is the Sabbath, no work is done. This is expressed by the phrase "And there was evening and there was morning, the seventh day" (Genesis 2:2-3). This is similar to a king who had a precious vessel that he did not want to bequeath to anyone but his son. Similarly, Thus, the Sabbath is a day of rest and holiness, and God only wanted to bestow it upon the Israelites. Know that it was the same when the Israelites left Egypt, before they were given the Torah, God gave them the Sabbath and they observed two Sabbaths until they received the Torah, as it is said in Nehemiah 9:14, "You made known to them Your holy Sabbath." And the Lord blessed and sanctified the Sabbath, and the Israelites are obligated to sanctify it. It is known that every forty years that the Israelites were in the wilderness, during the six days of the week, God provided them with manna, but on the Sabbath, no manna would come down, not because God lacked the power to give it, but because of the Sabbath. When the people saw this, they also observed the Sabbath, as it is said in Exodus 16:30, "So the people rested on the seventh day." Then God said, "This Sabbath I have given to Israel as a sign between Me and them." During the six days of creation, God worked on the world, and on the Sabbath, He rested. Therefore, it is said in Exodus 31:17, "Between Me and the children of Israel, it is a sign forever." God created seven heavens, but He did not choose any of them as His dwelling place except the Sabbath, as it is said in Psalm 68:5, "A father of orphans and a judge of widows is God in His holy dwelling." God created seven lands, but He did not choose any of them except for the land of Israel, as it is said in Deuteronomy 11:12, As it is said (Deuteronomy 11:12) "the eyes of God are always upon it." I created seven seas, and from all of them, I chose none except the Sea of Galilee, which I gave as an inheritance to the tribe of Naphtali. As it is said (Joshua 19:32-33) "Naphtali, he possesses the Sea and the south." I created seven worlds, and from all of them, I chose none except the seventh. Six were created for coming and going, and one, the entire seventh, was created for rest and repose for the life of the world. I created seven days, and from all of them, I chose none except the seventh day, as it is said (Genesis 2:3) "God blessed the seventh day." I created seven cycles of seven years, and from all of them, I chose none except the year of release, as it is said (Deuteronomy 15:1) "At the end of every seven years, you shall grant a release." And anyone who observes the Sabbath, the Holy One, blessed be He, forgives all his sins, as it is said (Isaiah 56:2) "Happy is the man who does this, he who holds fast to the Sabbath, not profaning it. And he who abstains from evil shall find favor."