Mishnah Machshirin 3:8: [If] one removes the wheels [from a wagon] or the [farming] implements of cattle [and puts them] in water when an east wind blows to strengthen them, that achieves BeKhi Yutan [if the water subsequently falls from them onto fruit]. [If] one takes an animal down [to the river] to drink, the water that comes up in its mouth achieves BeKhi Yutan, but the water on its legs does not achieve BeKhi Yutan. If he hoped that [the water] would wash its legs, even the water that comes up with its legs achieves BeKhi Yutan. At a time when [the animal's legs] are sore or it is threshing, the [water that touches its legs] is always impure. [If] a deaf-mute, an imbecile, or a minor took [the animal] down [to drink], even if he hoped that [the water] would wash its legs it does not achieve BeKhi Yutan, because they can act but they have no intention.

הַמּוֹרִיד אֶת הַגַּלְגַּלִּים וְאֶת כְּלֵי הַבָּקָר בִּשְׁעַת הַקָּדִים לַמַּיִם בִּשְׁבִיל שֶׁיָּחוּצוּ, הֲרֵי זֶה בְכִי יֻתַּן. הַמּוֹרִיד בְּהֵמָה לִשְׁתּוֹת, הַמַּיִם הָעוֹלִים בְּפִיהָ, בְּכִי יֻתַּן. וּבְרַגְלֶיהָ, אֵינָן בְּכִי יֻתַּן. אִם חָשַׁב שֶׁיּוּדְחוּ רַגְלֶיהָ, אַף הָעוֹלִין בְּרַגְלֶיהָ, בְּכִי יֻתַּן. בִּשְׁעַת הַיַּחַף וְהַדַּיִשׁ, לְעוֹלָם טָמֵא. הוֹרִיד חֵרֵשׁ שׁוֹטֶה וְקָטָן, אַף עַל פִּי שֶׁחוֹשֵׁב שֶׁיּוּדְחוּ רַגְלֶיהָ, אֵינָן בְּכִי יֻתַּן, שֶׁיֶּשׁ לָהֶן מַעֲשֶׂה וְאֵין לָהֶן מַחֲשָׁבָה:

Mishnah Machshirin 4:1: [If] one bends down to drink [from a river] the water that comes up in his mouth and on his mustache achieves BeKhi Yutan [a state where liquid put upon food makes it susceptible to impurity]. [The water that comes up] on his nose and on his head and in his beard does not achieve BeKhi Yutan. [If] one fills up a jar the water that comes up after it, and [the water] on the rope that is wound around its neck, and [the water] on the rope needed [for pulling it up] achieves BeKhi Yutan. How much [rope] is needed? Rabbi Shimon ben Elazar says: A hands-breadth. [If] one puts [the jar] under the gutter [of his roof] it does not achieve BeKhi Yutan.

הַשּׁוֹחֶה לִשְׁתּוֹת, הַמַּיִם הָעוֹלִים בְּפִיו וּבִשְׂפָמוֹ, בְּכִי יֻתַּן. בְּחָטְמוֹ וּבְרֹאשׁוֹ וּבִזְקָנוֹ, אֵינָן בְּכִי יֻתַּן. הַמְמַלֵּא בְּחָבִית, הַמַּיִם הָעוֹלִים אַחֲרֶיהָ, וּבַחֶבֶל שֶׁהוּא מְכֻנָּן עַל צַוָּארָהּ, וּבַחֶבֶל שֶׁהוּא לְצָרְכָּהּ, הֲרֵי זֶה בְכִי יֻתַּן. כַּמָּה הוּא צָרְכָּהּ. רַבִּי שִׁמְעוֹן בֶּן אֶלְעָזָר אוֹמֵר, טֶפַח. נְתָנָהּ תַּחַת הַצִּנּוֹר, אֵינָן בְּכִי יֻתַּן: