וַיַּ֛חַץ אֶת־שְׁלֹשׁ־מֵא֥וֹת הָאִ֖ישׁ שְׁלֹשָׁ֣ה רָאשִׁ֑ים וַיִּתֵּ֨ן שׁוֹפָר֤וֹת בְּיַד־כֻּלָּם֙ וְכַדִּ֣ים רֵקִ֔ים וְלַפִּדִ֖ים בְּת֥וֹךְ הַכַּדִּֽים׃
他把這三百人分成三隊，把號角和空瓶交在他們每個人手中，瓶內藏著火把。
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.