Reference for Niddah 71:1

אלא ללוי דאמר שני מעינות הן למה לי שבעה

but according to Levi, who said that the sources were two, why should it be necessary to count seven days, seeing that the slightest [break]<span class="x" onmousemove="('comment',' At the termination of the unclean period. ');">¹</span>

Jastrow