Reference for Chullin 168:19

דתניא ר' יוסי אומר

yet in a case of doubt does not even override the festival,<span class="x" onmousemove="('comment',' If a child was born at twilight there is a doubt as to the correct day for circumcision, and the child is circumcised on the ninth day; should this day happen to be a festival the circumcision is postponed to the tenth day. V. Shab. ibid.');">¹¹</span>

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