Reference for Niddah 126:62

ותרתי למה לי

AND THE TWENTIETH IS ESTABLISHED AS HER SETTLED PERIOD. FOR A WOMAN MAY NOT REGARD HER MENSTRUAL PERIODS AS SETTLED UNLESS THE RECURRENCE HAS BEEN REGULAR THREE TIMES; NOR IS SHE RELEASED FROM THE RESTRICTIONS OF A SETTLED PERIOD UNLESS IT HAS VARIED<span class="x" onmousemove="('comment',' Lit., 'that it shall be rooted out from her'. ');">⁵²</span>

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