Reference for Niddah 6:28

ושמאי לטהרות נמי לא דאם כן לבו נוקפו ופורש

[it may be objected:] Was it not in fact taught, in agreement with the latter version, that the reason is to avoid the neglect of propagation? It is this that Hillel in fact said to Shammai, 'Even if you give as your reason that "if in fact any blood were there it would have flowed out earlier," you must nevertheless make a fence<span class="x" onmousemove="('comment',' I.e., add some restriction (retrospective uncleanness) in order to avoid possible transgression of the law itself. ');">²⁴</span>

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow