Midrash Tanchuma, Toldot
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וְאֵלֶּה תּוֹלְדֹת יִצְחָק. זֶה שֶׁאָמַר הַכָּתוּב גִּיל יָגִיל אֲבִי צַדִּיק וְיוֹלֵד חָכָם יִשְׂמַח בּוֹ (משלי כג, כד). כְּנֶגֶד מִי אֲמָרוֹ שְׁלֹמֹה? לֹא אֲמָרוֹ אֶלָּא כְּנֶגֶד יִצְחָק, שֶׁבְּשָׁעָה שֶׁנּוֹלַד יִצְחָק, הָיוּ הַכֹּל שְׂמֵחִים, שָׁמַיִם וָאָרֶץ, חַמָּה וּלְבָנָה, כּוֹכָבִים וּמַזָּלוֹת. וּמִפְּנֵי מָה הָיוּ שְׂמֵחִים? שֶׁאִלְמָלֵא לֹא נִבְרָא יִצְחָק, לֹא הָיָה הָעוֹלָם מִתְקַיֵּם, שֶׁנֶּאֱמַר: אִם לֹא בְרִיתִי יוֹמָם וָלָיְלָה חֻקּוֹת שָׁמַיִם וָאָרֶץ לֹא שָׂמְתִּי (ירמיה לג, כה). וְאֵין בְּרִיתִי אֶלָּא יִצְחָק, שֶׁנֶּאֱמַר: וְאֶת בְּרִיתִי אָקִים אֶת יִצְחָק (בראשית יז, כא).
These are the generations of Isaac, Abraham’s son: Abraham begot Isaac (Gen. 25:19). Scripture states elsewhere in allusion to this verse: The father of the righteous will greatly rejoice; and he that begetteth a wise child will have joy of him (Prov. 23:24). Concerning whom did Solomon make this statement? He said it about Isaac. When Isaac was born, the entire universe rejoiced; the heavens and the earth, the sun and the moon, the stars and the planets. Why did they rejoice? Because the world would not have survived had Isaac not been born, as it is said: If My covenant be not with day and night, if I have not appointed the ordinance of heaven and earth (Jer. 33:25). My covenant refers to Isaac, as it is said: I will establish My covenant with Isaac (Gen. 17:21).