Reference for Tevul Yom 2:4

הַמִּקְפָּה וְהַחֲמִיטָה שֶׁל חֻלִּין וְהַשֶּׁמֶן שֶׁל תְּרוּמָה צָף עַל גַּבֵּיהֶן, וְנָגַע טְבוּל יוֹם בַּשֶּׁמֶן, לֹא פָסַל אֶלָּא הַשֶּׁמֶן. וְאִם חִבֵּץ, כָּל מָקוֹם שֶׁהוֹלֵךְ הַשֶּׁמֶן, פָּסָל:

If a porridge or a flat batter-cake were of <i>chullin</i>, and oil of <i>terumah</i> was floating on them, and a <i>tevul yom</i> touched the oil, he has only invalidated the oil. If he mixed [them together], any place the oil went to is invalid [i.e. impure].

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