Talmud for Demai 1:3
הַלּוֹקֵחַ לְזֶרַע וְלִבְהֵמָה, קֶמַח לְעוֹרוֹת, שֶׁמֶן לְנֵר, שֶׁמֶן לָסוּךְ בּוֹ אֶת הַכֵּלִים, פָּטוּר מִן הַדְּמַאי. מִכְּזִיב וּלְהַלָּן, פָּטוּר מִן הַדְּמַאי. חַלַּת עַם הָאָרֶץ, וְהַמְדֻמָּע, וְהַלָּקוּחַ בְּכֶסֶף מַעֲשֵׂר שֵׁנִי, וּשְׁיָרֵי הַמְּנָחוֹת, פְּטוּרִין מִן הַדְּמַאי. שֶׁמֶן עָרֵב, בֵּית שַׁמַּאי מְחַיְּבִין, וּבֵית הִלֵּל פּוֹטְרִין:
One who buys for seed or for domestic animals, flour for skins, oil for lighting, or oil for utensil grease; [these are] exempt from <i>Demai</i>. [Areas located] from K’ziv and beyond are exempt from <i>Demai</i>. The <i>Challah</i> [dough that must be set aside for the priest] of an <i>Am HaAretz</i>, and a mixture of regular produce with <i>Terumah</i> [produce consecrated for priestly consumption], and that which was bought with money of the second tithe, and the remnant of the meal offering, are exempt from <i>Demai</i>. Fragrant oil is obligated by the school of Shammai, and the school of Hillel exempts.