Reference for Beitzah 8:10
אמר אביי כותיה דרב מסתברא דתנן בראשונה היו משיאין משואות משקלקלו הכותים התקינו שיהו שלוחין יוצאין
Abaye said: "It seems logical [for the law regarding the egg] to be according to Rav. As it is taught [in a Mishnah]: 'In the beginning, they would light torches [to announce the sighting of the new moon]. Since the confusion of the Samaritans [who would disrupt the torches], they decreed that there would be messengers who went out [and declared the sighting of the new moon].'
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