Reference for Zevachim 226:16

שעיר המשתלח:

But surely R'Hisda said: The people in the generation of the Flood sinned with hot passion, and with hot water they were punished?<span class="x" onmousemove="('comment',' It would have been scalded.');">¹³</span> - And on your view, how could the Ark travel [at all]?<span class="x" onmousemove="('comment',' Since its seams were caulked with pitch, why did not the pitch dissolve in the hot water and leave the Ark unseaworthy?');">¹⁴</span>

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