Reference for Orlah 2:5

דּוֹסְתַּאי אִישׁ כְּפַר יִתְמָה, הָיָה מִתַּלְמִידֵי בֵית שַׁמַּאי, וְאָמַר, שָׁמַעְתִּי מִשַּׁמַּאי הַזָּקֵן שֶׁאָמַר, לְעוֹלָם אֵינוֹ מְטַמֵּא עַד שֶׁיְּהֵא בּוֹ כַּבֵּיצָה:

Dostai, of the village of Yitmah, was one of the disciples of Bet Shammai, and he said, I received a tradition from Shammai the elder who said, it [one of the items mentioned above] never defiles unless it contains [the volume of an] egg.

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