וְקוֹל֙ כַּנְפֵ֣י הַכְּרוּבִ֔ים נִשְׁמַ֕ע עַד־הֶחָצֵ֖ר הַחִיצֹנָ֑ה כְּק֥וֹל אֵל־שַׁדַּ֖י בְּדַבְּרֽוֹ׃
And the sound of the wings of the cherubim was heard even to the outer court, as the voice of God Almighty when He speaketh.
Sifra
11) Similarly, (Ezekiel 10:5): "And the sound of the wings of the cherubs was heard (only) until the outer court." I might think that this was because it was a low sound; it is, therefore, written (Ezekiel 10:5): "like the voice of the almighty G d in His speaking" — in His speaking at Sinai. If so, why (only) "until the outer court"? Once it reached the outer court, it was "cut off."