Reference for Rosh Hashanah 49:1

וערבית במערב א"ר יוחנן בן נורי עדי שקר הם כשבאו ליבנה קיבלן רבן גמליאל

AND IN THE EVENING IN THE WEST.<span class="x" onmousemove="('comment',' We should naturally suppose this to mean that they saw the old moon in the morning and the new moon in the evening.');">¹</span> R'JOHANAN B. NURI THEREUPON SAID, THEY ARE FALSE WITNESSES.<span class="x" onmousemove="('comment',' Presumably because according to what has been stated above (20b) the old moon is never visible for twenty-four hours before the new appears. But v. infra at the beginning of the Gemara and notes.');">²</span> WHEN, HOWEVER, THEY CAME TO JABNEH RABBAN GAMALIEL ACCEPTED THEM.

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