Reference for Zevachim 43:13

אמר רב פפא אם קדח בו רביעית מטבילין בו מחטין וצינוריות הואיל ומהכשירא דמקוה אתיא

it is [fit] eve for a rebi'ith too;<span class="x" onmousemove="('comment',' If the rebi'ith is partly made up of such miry clay, it is sufficient and valid for the ritual washing of the hands.');">¹⁶</span> while if a cow would not bend and drink thereof, it cannot make up even [the quantity of] a mikweh too! Again, if it is to exclude red insects,<span class="x" onmousemove="('comment',' Which originate in the water.');">¹⁷</span>

Jastrow

Jastrow

Jastrow