Invalid Shofar Blowing on the Eve of Rosh Hashanah
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Question
Is it permissible to blow the shofar on the eve of Rosh Hashanah with a sound that cannot fulfill the obligation, such as placing a thin layer of wax around the mouthpiece of the shofar or covering the sound exit with cloth?
Answer
Shalom Rav
It is not permissible to blow the shofar at all on the eve of Rosh Hashanah.
Source
Since in all the shofar sounds during the month of Elul, the validity is not hindered, yet it was said to stop and not blow, and it was not said to blow an invalid sound.
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