Reference for Bekhorot 75:6

לא תימא שמא אלא

Thereupon R'Tahlifa said to him: You should not say 'perhaps', it certainly refers to the borer and [the removal of] what stopped up [the hole], and you can confidently accept this explanation as we accept the evidence of Hezekiah the father of Ikkesh.<span class="x" onmousemove="('comment',' Though his statement which follows appeared difficult, every effort was made to explain it, since it was known to have been reliable in substance.');">⁵</span>

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