Mishnah Yadayim 1:5: Waters into which the baker has dipped [unbaked] rolls are invalid. And when he [instead] rinses his hands in them [and then splashes the rolls with water from his hands], they are valid [i.e. the waters in which he rinsed his hands]. Anyone is valid to pour onto the hands [of another person, in order to wash them], even a deaf-mute, shoteh, or a minor. A man may place a cask between his knees to pour [the water over his hands, to wash them], or tip a barrel onto its side and pour [onto his hands]. An ape may pour [water for washing] onto one's hands. Rabbi Yose considers these two [i.e. tipping a barrel or using an ape] to be invalid.

הַמַּיִם שֶׁהַנַּחְתּוֹם מַטְבִּיל בָּהֶם אֶת הַגְּלֻסְקִין, פְּסוּלִים. וּכְשֶׁהוּא מֵדִיחַ אֶת יָדָיו בָּהֶן, כְּשֵׁרִים. הַכֹּל כְּשֵׁרִים לִתֵּן לַיָּדַיִם, אֲפִלּוּ חֵרֵשׁ שׁוֹטֶה וְקָטָן. מַנִּיחַ חָבִית בֵּין בִּרְכָּיו וְנוֹטֵל. מַטֶּה חָבִית עַל צִדָּהּ וְנוֹטֵל. וְהַקּוֹף נוֹטֵל לַיָּדַיִם. רַבִּי יוֹסֵי פוֹסֵל בִּשְׁנֵי אֵלּוּ:

Mishnah Yadayim 2:1: 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 log, a specific unit of volume, of water]. If a loaf of terumah [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 log of waters which one washed one's hands with] it is pure. Rabbi Yose considers it impure.

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: