וְאָמַר רַבִּי יוֹחָנָן, מַאי דִּכְתִיב: ״וְלֹא קָרַב זֶה אֶל זֶה כׇּל הַלָּיְלָה״ — בִּקְּשׁוּ מַלְאֲכֵי הַשָּׁרֵת לוֹמַר שִׁירָה, אָמַר הַקָּדוֹשׁ בָּרוּךְ הוּא: מַעֲשֵׂה יָדַי טוֹבְעִין בַּיָּם, וְאַתֶּם אוֹמְרִים שִׁירָה?
And similarly, Rabbi Yoḥanan said: What is the meaning of that which is written: “And the one came not near the other all the night” (Exodus 14:20)? The ministering angels wanted to sing their song, for the angels would sing songs to each other, as it states: “And they called out to each other and said” (Isaiah 6:3), but the Holy One, Blessed be He, said: The work of My hands, the Egyptians, are drowning at sea, and you wish to say songs? This indicates that God does not rejoice over the downfall of the wicked.
אָמַר רַבִּי אֶלְעָזָר: הוּא אֵינוֹ שָׂשׂ, אֲבָל אֲחֵרִים מֵשִׂישׂ. וְדַיְקָא נָמֵי, דִּכְתִיב: ״כֵּן יָשִׂישׂ״, וְלָא כְּתִיב ״יָשׂוּשׂ״. שְׁמַע מִינַּהּ.
Rabbi Elazar said that this is how the matter is to be understood: Indeed, God Himself does not rejoice over the downfall of the wicked, but He causes others to rejoice. The Gemara comments: One can learn from the language of the verse as well, as it is written: “So the Lord will rejoice [ken yasis]” (Deuteronomy 28:63). And it is not written yasus, the grammatical form of the verb meaning: He will rejoice. Rather, it is written yasis. The grammatical form of this verb indicates that one causes another to rejoice. Consequently, these words are understood to mean that God will cause others to rejoice. The Gemara concludes: Indeed, learn from it that this is the case.