Reference for Chullin 168:21

מקל וחומר

They said to him: But the sounding of the Shofar in the provinces could prove otherwise,<span class="x" onmousemove="('comment',' It is established law that if Rosh Hashanah happened to fall on Sabbath the Shofar was blown in the Temple (or, in Jerusalem - Maim.) but not in any other place in the land of Israel. V. R.H. 29b.');">¹³</span>

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