Reference for Yadayim 2:1

נָטַל לְיָדוֹ אַחַת מִשְּׁטִיפָה אַחַת, יָדוֹ טְהוֹרָה. לִשְׁתֵּי יָדָיו מִשְּׁטִיפָה אַחַת, רַבִּי מֵאִיר מְטַמֵּא, עַד שֶׁיִּטֹּל מֵרְבִיעִית. נָפַל כִּכָּר שֶׁל תְּרוּמָה, טָהוֹר. רַבִּי יוֹסֵי מְטַמֵּא:

If one poured [water] onto one of his hands in one washing [i.e. pouring only once], his hand is pure. If [one poured] onto both of his hands in one washing, Rabbi Meir considers them impure until one pours [onto one's hands, in one pouring,] a quarter [of a <i>log</i>, a specific unit of volume, of water]. If a loaf of <i>terumah</i> [a portion of a crop given to a priest, which can only be consumed by priests or their household] falls into them [i.e. into the quarter <i>log</i> of waters which one washed one's hands with] it is pure. Rabbi Yose considers it impure.

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