וַֽיְהִי֙ בַּלַּ֣יְלָה הַה֔וּא וַיֹּ֤אמֶר אֵלָיו֙ יְהוָ֔ה ק֖וּם רֵ֣ד בַּֽמַּחֲנֶ֑ה כִּ֥י נְתַתִּ֖יו בְּיָדֶֽךָ׃
I stało się onej nocy, że rzekł doń Wiekuisty: Wstań, wtargnij do obozu, albowiem wydałem go w moc twoją.
Rashi
Shofars and torches to invoke the merit of the giving of the Torah.10 At Mount Sinai, when the shofar sounded, and fire descended on the mountain. (Shemos, 19:16–19). According to the plain explanation: this took place at night, as it is written,11V. 9. and it was dark. They therefore carried torches to provide them with light. They placed them in pitchers so that the torches would remain undetected.