Talmud for Rosh Hashanah 54:8
במינו כשר אמר רבי יוחנן והוא שנשתייר רובו מכלל דשלא במינו אע"פ שנשתייר רובו פסול
If one shofar is put inside another shofar, if one can hear the sound of the inner on he thereby performs his religious duty, but if he hears the sound of the outer one he does not thereby perform his religious duty.<span class="x" onmousemove="('comment',' Because as the sound comes from the air between the two shofars, it is as if made by two or three shofars. V. Tosaf. s.v. .');"><sup>9</sup></span> Our Rabbis taught: If it was scraped whether on the inside or the outside, it is valid.
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