Reference for Rosh Hashanah 60:5

<big><strong>מתני׳</strong></big> בראשונה היו מקבלין עדות החדש כל היום פעם

He thought that Rabban Johanan B'Zaccai declared it only Rabbinically forbidden, but this is not the case: he declared it forbidden from the Pentateuch. But it is stated that 'he ordained'?<span class="x" onmousemove="('comment',' Heb. a term usually applied to ordinances of the Rabbis not derived from the written text.');">⁵</span>

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