Hebrew · Midrash Rabbah (Hebrew, Torat Emet)לְעוֹלָם ה' דְּבָרְךְ נִצָּב בַּשָּׁמָיִם (תהלים קיט, פט), הָא בָּאָרֶץ לֹא, אֶלָּא מַה שֶּׁאָמַרְתָּ לְאַבְרָהָם בַּשָּׁמָיִם (בראשית יח, יד): לַמּוֹעֵד אָשׁוּב אֵלֶיךָ כָּעֵת חַיָּה. רַבִּי נַחְמָן דְּיָפוֹ מִשֵּׁם רַבִּי יַעֲקֹב דְּקֵיסָרִין פָּתַח (תהלים פ, טו): אֱלֹהִים צְבָאוֹת שׁוּב נָא הַבֵּט מִשָּׁמַיִם וּרְאֵה וּפְקֹד גֶּפֶן זֹאת, שׁוּב וַעֲשֵׂה מַה שֶּׁאָמַרְתָּ לְאַבְרָהָם (בראשית טו, ה): הַבֶּט נָא הַשָּׁמַיְמָה וּסְפֹר הַכּוֹכָבִים. וּפְקֹד גֶּפֶן זֹאת, וַה' פָּקַד אֶת שָׂרָה. רַבִּי שְׁמוּאֵל בַּר נַחְמָן פָּתַח (במדבר כג, יט): לֹא אִישׁ אֵל וִיכַזֵּב וּבֶן אָדָם וְיִתְנֶחָם, אָמַר רַבִּי שְׁמוּאֵל הַפָּסוּק הַזֶּה לֹא רֹאשׁוֹ סוֹפוֹ וְלֹא סוֹפוֹ רֹאשׁוֹ, לֹא אִישׁ אֵל וִיכַזֵּב וגו' הַהוּא אָמַר וְלֹא יַעֲשֶׂה וְדִבֶּר וְלֹא יְקִימֶנָּה, אֶלָּא בְּשָׁעָה שֶׁהַקָּדוֹשׁ בָּרוּךְ הוּא גּוֹזֵר לְהָבִיא טוֹבָה לָעוֹלָם, לֹא אִישׁ אֵל וִיכַזֵּב, וּבְשָׁעָה שֶׁהוּא גּוֹזֵר לְהָבִיא רָעָה, הַהוּא אָמַר וְלֹא יַעֲשֶׂה. בְּשָׁעָה שֶׁאָמַר לְאַבְרָהָם (בראשית כא, יב): כִּי בְיִצְחָק יִקָּרֵא לְךָ זָרַע, לֹא אִישׁ אֵל וִיכַזֵּב. וּבְשָׁעָה שֶׁאָמַר לוֹ (בראשית כב, ב): קַח נָא אֶת בִּנְךָ אֶת יְחִידְךָ, הַהוּא אָמַר וְלֹא יַעֲשֶׂה. בְּשָׁעָה שֶׁאָמַר הַקָּדוֹשׁ בָּרוּךְ הוּא לְמשֶׁה (שמות ג, טז): פָּקֹד פָּקַדְתִּי אֶתְכֶם, לֹא אִישׁ אֵל וִיכַזֵּב. בְּשָׁעָה שֶׁאָמַר לוֹ הַקָּדוֹשׁ בָּרוּךְ הוּא (דברים ט, יד): הֶרֶף מִמֶּנִּי וְאַשְׁמִידֵם, הַהוּא אָמַר וְלֹא יַעֲשֶׂה. בְּשָׁעָה שֶׁאָמַר הַקָּדוֹשׁ בָּרוּךְ הוּא לְאַבְרָהָם (בראשית טו, יד): וְגַם אֶת הַגּוֹי, לֹא אִישׁ אֵל וִיכַזֵּב, וּבְשָׁעָה שֶׁאָמַר לוֹ (בראשית טו, יג): וַעֲבָדוּם וְעִנּוּ אֹתָם, הַהוּא אָמַר וְלֹא יַעֲשֶׂה. בְּשָׁעָה שֶׁאָמַר לוֹ הַקָּדוֹשׁ בָּרוּךְ הוּא (בראשית יח, י): שׁוֹב אָשׁוּב אֵלֶיךָ, לֹא אִישׁ אֵל וִיכַזֵּב, אֶלָּא וַה' פָּקַד אֶת שָׂרָה.
English · The Sefaria Midrash Rabbah (2022)“Forever, Lord, Your word stands firm in the heavens” (Psalms 119:89) – is this to imply that it is not so on earth? It means, rather, that what You said to Abraham in the heavens [stands firm]: “At the prescribed time, I will return to you; at this very time next year, [Sarah will have a son]” (Genesis 18:14).
Rabbi Naḥman of Yafo in the name of Rabbi Yaakov of Caesarea began: “God of hosts, please return. Look from heaven and see, and remember this vine” (Psalms 80:15) – return and perform what You said to Abraham: “Look now toward the heavens, and count the stars” (Genesis 15:5). “Remember this vine” – “the Lord remembered Sarah.”
Rabbi Shmuel bar Naḥman began: “God is not a man, that He would lie, or the son of man, that He would reconsider” (Numbers 23:19). Rabbi Shmuel said: This verse, its beginning does not correspond to its end, and its end does not correspond to its beginning. [The beginning states:] “God is not a man, that He would lie…[and the end states] He will say and not perform, speak and not fulfill” (Numbers 23:19). The explanation is that when the Holy One blessed be He decrees to bring something good upon the world, “God is not a man, that He would lie.” But when he decrees to bring something detrimental, [sometimes] “He will say and not perform, speak and not fulfill.” When He said to Abraham: “For it is through Isaac that descendants will be considered for you” (Genesis 21:12) – “God is not a man, that He would lie.” But when He said to him: “Take now your son, your only one […and offer him up]” (Genesis 22:2) – “He will say and not perform.” When the Holy One blessed be He said to Moses: “I have remembered you [and what has been done to you in Egypt, and I said: I shall bring you up from the affliction of Egypt] (Exodus 3:16–17) – “God is not a man, that He would lie.” When the Holy One blessed be He said to him: “Let Me be, and I shall destroy them” (Deuteronomy 9:14) – “He will say and not perform.” When the Holy One blessed be He said to Abraham: “And also that nation [whom they will serve, I shall judge]” (Genesis 15:14) – “God is not a man, that He would lie.” But when He said to him: “They will be enslaved to them and they will oppress them [four hundred years]” (Genesis 15:13) – “He will say and not perform.” When the Holy One blessed be He said to him [Abraham]: “I will surely return to you […and, behold, a son for Sarah your wife]” (Genesis 18:10) – “God is not a man, that He would lie.” Rather, “the Lord remembered Sarah.”