Answers

  1. After the sin of the golden calf, Moshe went up to Mount Sinai to receive the second set of Tablets on Rosh Chodesh Elul. On that day, the Jewish People sounded the shofar to remind themselves to stray no more after idol worship. Also, the sound of the shofar strikes awe into our hearts and inspires us to return to the ways of Torah. (Mishna Berura and Aruch Hashulchan Orach Chaim 581)

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