Reference for Demai 6:6

בֵּית שַׁמַּאי אוֹמְרִים, לֹא יִמְכֹּר אָדָם אֶת זֵיתָיו אֶלָּא לְחָבֵר. בֵּית הִלֵּל אוֹמְרִים, אַף לִמְעַשֵּׂר. וּצְנוּעֵי בֵית הִלֵּל הָיוּ נוֹהֲגִין כְּדִבְרֵי בֵית שַׁמָּאי:

Those who follow the school of Shammai say: a man should not sell his olives except to a <i>Chaver</i> [one who scrupulously observes purity laws]. Those who follow the house of Hillel say: even for the tithe. And the modest ones among those who follow the school of Hillel would act in accordance with the words of those who follow the school of Shamai.

Jastrow

Jastrow