Reference for Keritot 15:33

תדע דאחת בלילה וב' ביום מביא דהא ראייה ראשונה שכבת זרע בעלמא ואילו חזי תרתין אחרנייתא מצטרפי להו

he has to bring a [second] offering; if on the night [of the eighth day], he does not bring [an offering]; while R'Johanan holds, Even on the night [of the eighth day] he has to bring?<span class="x" onmousemove="('comment',' Obviously this opinion cannot agree with the principle that the night renders the period wanting in time.');">²⁰</span>

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