Reference for Niddah 145:24

ת"ל (ויקרא טו, כו) כמשכב נדתה

the eleventh and for excluding the twelfth? I include the eleventh since it is suitable for being counted [as one of the seven clean days following the one<span class="x" onmousemove="('comment',' The fourth day. ');">²¹</span>

Jastrow

Jastrow

Jastrow