וְאַחַ֤ר הָרַ֙עַשׁ֙ אֵ֔שׁ לֹ֥א בָאֵ֖שׁ יְהוָ֑ה וְאַחַ֣ר הָאֵ֔שׁ ק֖וֹל דְּמָמָ֥ה דַקָּֽה׃
e depois do terremoto um fogo, porém o SENHOR não estava no fogo; e ainda depois do fogo uma voz mansa e delicada.
Rambam
From where [is there proof that] that even [when there is only] one [person] sitting, etc.: In the first chapter of Berakhot 6a, it states in this language, "And from where is it derived that one who sits and engages in Torah [study], the Divine Presence is with him? As it is stated: 'In every place where I cause My Name to be mentioned, I will come to you and bless you' (Exodus 20:21); Since even one, was it necessary [to say] two? [With] two, their words are written in the book of remembrance; with one, his words are not written in a book of remembrance. And since even two, was it necessary [to say] three? Lest you say that judgment is merely peace, and the Divine Presence does not come. [Instead,] we understand that sitting in judgment is also Torah. And since even three, was it necessary [to say] ten? [With] ten, the Divine Presence precedes [them] and comes; [with] three, not until they sit." And the explanation of "he is silent (vayidom)" as being from the hidden speech is from "a still (demamah) small voice" (I Kings 19:12). And from this [idea] did the [Onkelos' Aramaic] translation explain, "And Aharon was silent" (Leviticus 10:3) [as] "And Ahaon praised." And his proof that he is like one that observed the entire Torah completely is from his saying, "since he takes it on himself" (Lamentations 3:28) - it is as if the giving of the entire Torah was only for his sake.
Bartenura
“'and is silent (vayidom'": It is a term [related to the usage], kol demamah dakah (a still-small voice). As the way of one who learns alone is to learn while whispering.
Sforno
ויהי קולות וברקים. The spectacle was similar to that experienced by the prophet Elijah at the same mountain in Kings I 19,11-12. David, in Psalms 68,9, also describes what happened at Sinai in similar terms.
Rashi
a faint voice I heard the sound of faint words. Another explanation: I heard silence and a voice. I heard the voice of the silence, but the silence I did not hear. “Silence” denotes angels reciting praise silently, as [Jonathan] renders (I Kings 19:12): “a still small voice” as: a voice of those praising quietly. Moses heard the silence [i.e., the voice of the angels praising]—from here we deduce that the early prophets heard [lit. used] the voice, whereas the later ones heard an echo, like a man who hits with a hammer, and the echo resounds far away. From here... far away. Here it is written: silence and a voice, whereas concerning Elijah it is written: a still small voice; because Eliphaz heard only the silencing of the voice, like a person who shouts into a barrel, that the voice of the barrel shouts toward him. That is an echo, not the voice itself, but concerning Elijah if is written: a still, small voice, for he heard the voice itself] And this is what it said.