Reference for Niddah 33:17

והוא שלנו בכלי מתכות

'Removing one's nails and throwing them away in a public thoroughfare'. [This is dangerous] because a pregnant woman passing over them would miscarry. This, however, has been said only of a case where one removes them with a pair of scissors. Furthermore, this has been said only of a case where one removes the nails of both hands and feet. Furthermore, this has been said only in the case where one did not cut anything immediately after cutting them but if something was cut immediately after they were cut there can be no danger.<span class="x" onmousemove="('comment',' Lit., 'we have nothing against it'. ');">¹³</span>

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