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Source and decoding - Sukkah 11b
הָנִיחָא לְמַאן דְּאָמַר עַנְנֵי כָבוֹד הָיוּ. אֶלָּא לְמַאן דְּאָמַר סוּכּוֹת מַמָּשׁ עָשׂוּ לָהֶם, מַאי אִיכָּא לְמֵימַר? דְּתַנְיָא: ״כִּי בַסּוּכּוֹת הוֹשַׁבְתִּי אֶת בְּנֵי יִשְׂרָאֵל״, עַנְנֵי כָבוֹד הָיוּ, דִּבְרֵי רַבִּי אֱלִיעֶזֶר.
Reish Lakish derives from the mist rising from the earth that covering must not contract impurity and must grow from the ground. The excerpt asks how this derivation fits the view that Israel dwelled in actual booths rather than clouds of glory, and introduces the dispute between Rabbi Eliezer and Rabbi Akiva.
On the verse "For I made the children of Israel dwell in sukkot," they disagree: Rabbi Eliezer says these were clouds of glory, Rabbi Akiva says they made actual booths. The Gemara uses this dispute to examine the law of the covering.