בראשית רבה י״א:ו׳
מַה שֶּׁנִּבְרָא בְּשֵׁשֶׁת יְמֵי בְרֵאשִׁית צְרִיכִין עֲשִׂיָה, כְּגוֹן הַחַרְדָּל צָרִיךְ לְמִתּוּק. הַתּוּרְמוּסִים צָרִיךְ לְמִתּוּק. הַחִטִּין צְרִיכִין לְהִטָּחֵן. אֲפִלּוּ אָדָם צָרִיךְ תִּקּוּן.
Bereishit Rabbah 11:6
[R. Hoshaya said, in response to a philosopher who asked him why, if circumcision is so precious to God, he was not born circumcised]: Anything created in the first six days, needs further actions, for example mustard seeds need sweetening, peas needs sweetening, wheat needs grinding, even humans need fixing.
תלמוד בבלי, שבת י׳ א:יהוה
כל דיין שדן דין אמת לאמיתו אפילו שעה אחת - מעלה עליו הכתוב כאילו נעשה שותף להקדוש ברוך הוא במעשה בראשית.
Babylonian Talmud, Shabbat 10a:5
Every judge who judges with complete fairness, even for a single hour, tradition gives that judge credit as though they had become a partner to the Holy Blessed One in the creation. [AJWS translation]
(ג) וַיְבָ֤רֶךְ אֱלֹהִים֙ אֶת־י֣וֹם הַשְּׁבִיעִ֔י וַיְקַדֵּ֖שׁ אֹת֑וֹ כִּ֣י ב֤וֹ שָׁבַת֙ מִכׇּל־מְלַאכְתּ֔וֹ אֲשֶׁר־בָּרָ֥א אֱלֹהִ֖ים לַעֲשֽׂוֹת׃ {פ}
(3) And God blessed the seventh day and declared it holy—having ceased on it from all the work of creation that God had done (lit: "to do").
רמבן, בראשית ב:ג
ודע, כי נכלל עוד במלת "לעשות" כי ששת ימי בראשית הם כל ימות עולם
Ramban, Genesis.2.3
And know that there is more encompassed in the words “to do,” for the six days of creation are akin to the days of the existence of the world. [AJWS translation]
מדרש שמואל ד:א
מעשה ברבי ישמעאל ורבי עקיבה שהיו מהלכין בחוצות ירושלים והיה עמהן אדם אחד, פגע בהם אדם חולה, אמר להן רבותי אמרו לי במה אתרפא, אמרו לו קח לך כך וכך עד שתתרפא, אמר להן אותו האיש שהיה עמהן מי הכה אותו בחולי, אמרו לו הקדוש ברוך הוא, אמר להן ואתם הכנסתם עצמכם בדבר שאינו שלכם, הוא הכה ואתם מרפאין, אמרו לו מה מלאכתך, אמר להן עובד אדמה אני והרי המגל בידי, אמרו לו מי ברא את האדמה, מי ברא את הכרם, אמר להם הקדוש ברוך הוא, אמרו לו ואתה מכניס עצמך בדבר שאינו שלך, הוא ברא אותו ואת אוכל פריין שלו, אמר להן אין אתם רואין המגל בידי אלולי שאני יוצא וחורשו ומכסתו ומזבלו ומנכשו לא העלה מאומה, אמרו לו שוטה שבעולם ממלאכתך לא שמעת מה שכתוב אנוש כחציר ימיו, כשם שהעץ אם אינו נזבל ומתנכש ונחרש אינו עולה, ואם עלה ולא שתה מים (ולא נזבל) אינו חי והוא מת, כך הגוף הוא העץ, הזבל הוא הסם, איש אדמה הוא הרופא.
Midrash Samuel 4:1
Once Rabbi Ishmael and Rabbi Akiva were strolling in the streets of Jerusalem along with another man. They met a sick person who said to them, “Masters, can you tell me how I can be healed?” They said to him, "Take such-and-such until you felt better." The man strolling with the two rabbis turned to them and said, “Who made this man sick?” “The Holy Blessed One,” they replied. “And you presume to interfere in an area that is not yours?” the man remarked. “God has afflicted and you heal?” “What is your occupation?” they asked the man. “I’m a tiller of the soil,” he answered, “as you can see from the sickle I carry.” “Who created the land and who created the vineyard?” “The Holy Blessed One.” And they said, “And you dare to move into an area that is not yours? God created these and you eat their fruit?” He said to them, “Don’t you see the sickle in my hand?” the man asked. “If I did not go out and plow the field, water it, fertilize it, weed it, no food would grow!” Fool,” the rabbis said, “have you not heard that the days of people are like a harvest. Just as a tree that is not fertilized and weeded and pruned does not grow, and if it grows and does not drink (or take fertilizer) it does not live and dies, so to the body is a tree—the medicine is the fertilizer and the doctor is the farmer.” [AJWS translation]
At the beginning of time, God’s presence filled the universe. When God decided to bring this world into being, to make room for creation, God first drew in a breath, contracting God's Self. From that contraction darkness was created. And when God said, “Let there be light” (Gen. 1:3), the light that came into being filled the darkness, and ten holy vessels came forth, each filled with primordial light.
The main idea here is the ongoing work of Creation as the responsibility of every Jew to pursue in partnership with God. Both every Jewish ritual act, such as reciting the Kiddush on Friday nights and every ethical and justice-seeking act is not only good, but is at the core of what it means to be in relationship with God and to fulfill the Jewish people's covenant with God. In fact, there is not clear separation between ritual and ethical behavior within the framework of Jewish obligation. The world is not created; we are creating it. In this way, tikkun olam can be seen as more than just improving the world, but the very reason for human existence: Ours is a sacred responsibility to continue God's work of Creation, as the world God created is inherently broken and incomplete.

