Reference for Yoma 57:2

אישתא דסיתוא קשיא מדקייטא וסימניך תנורא קרירא מיגמר בעתיקתא קשיא מחדתא וסימניך טינא בר טינא

The end of the summer is more trying than the summer itself, your analogy being a hot oven.<span class="x" onmousemove="('comment',' It is easy to kindle a fresh fire in a hot oven, the ground being dry. By the end of summer the atmosphere is very hot so that any additional hot weather makes it well nigh intolerable.');">³</span> A fever in winter is severer than in summer, your analogy being a cold oven.<span class="x" onmousemove="('comment',' It requires a great deal of wood and effort to warm up the cold oven in the cold days of winter. Thus must a fever be very severe to afflict one on a cold day.');">⁴</span>

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