Exodus 19:17שמות י״ט:י״ז
And Moshe brought the people out of the camp to meet with God; and they stood at the foot of the mountain.
Shabbat 88a:5שבת פ״ח א:ה׳
The Gemara cites additional homiletic interpretations on the topic of the revelation at Sinai. The Torah says, “And Moses brought forth the people out of the camp to meet God; and they stood at the lowermost part of the mount” (Exodus 19:17). Rabbi Avdimi bar Ḥama bar Ḥasa said: the Jewish people actually stood beneath the mountain, and the verse teaches that the Holy One, Blessed be He, overturned the mountain above the Jews like a tub, and said to them: If you accept the Torah, excellent, and if not, there will be your burial. Rav Aḥa bar Ya’akov said: From here there is a substantial caveat to the obligation to fulfill the Torah. The Jewish people can claim that they were coerced into accepting the Torah, and it is therefore not binding. Rava said: Even so, they again accepted it willingly in the time of Ahasuerus, as it is written: “The Jews ordained, and took upon them, and upon their seed, and upon all such as joined themselves unto them” (Esther 9:27), and he taught: The Jews ordained what they had already taken upon themselves through coercion at Sinai.
Or HaChaim on Exodus 19:17:1אור החיים על שמות י״ט:י״ז:א׳
ויוצא משה את העם, Moses lead out the people, etc. Perhaps this was necessary because the people had become afraid of the Mountain by now. Moses took them to the edge of the Mountain so that they would accept the Torah while standing there.
Rashba on Shabbat 88a:1רשב״א על שבת פ״ח א:א׳
...
Gur Aryeh on Shemot 19:17:2גור אריה על שמות י״ט:י״ז:ב׳
...