Mishnah Machshirin 3:4: [If] one sprinkles his house [with water] and [then] puts wheat in it which became damp, if it was because of the water it achieves BeKhi Yutan; and if it was because of the rock [floor] it does not achieve BeKhi Yutan. [If] one launders his clothing in a trough and [then] puts wheat in it which got damp, if it was because of the water it achieves BeKhi Yutan; and if it was because of itself [the trough] it does not achieve BeKhi Yutan. [If] one put [fruit] in sand to get it damp it achieves BeKhi Yutan. It once happened that the people of Machoz would dampen [their wheat] in sand, [and] the Sages said to them: If this is how you act, you have never made pure [food] in your lives.

הַמְרַבֵּץ אֶת בֵּיתוֹ וְנָתַן בּוֹ חִטִּים וְטָנְנוּ, אִם מֵחֲמַת הַמַּיִם, בְּכִי יֻתַּן. וְאִם מֵחֲמַת הַסֶּלַע, אֵינָן בְּכִי יֻתַּן. הַמְכַבֵּס אֶת כְּסוּתוֹ בַּעֲרֵבָה, נָתַן בָּהּ חִטִּים וְטָנְנוּ, אִם מֵחֲמַת הַמַּיִם, בְּכִי יֻתַּן. אִם מֵחֲמַת עַצְמָן, אֵינָן בְּכִי יֻתַּן. הַמְטַנֵּן בְּחֹל, הֲרֵי זֶה בְכִי יֻתַּן. מַעֲשֶׂה בְאַנְשֵׁי הַמָּחוֹז שֶׁהָיוּ מְטִנִּין בְּחֹל, אָמְרוּ לָהֶם חֲכָמִים, אִם כָּךְ הֱיִיתֶם עוֹשִׂים, לֹא עֲשִׂיתֶם טָהֳרָה מִימֵיכֶם:

Mishnah Machshirin 3:5: [If] one dampens [fruit] in dried clay, Rabbi Shimon says: If there is liquid dripping onto it, it achieves BeKhi Yutan, and if not, it does not achieve BeKhi Yutan. [If] one sprinkles [water] in his granary, he need not worry that he put wheat in it that became damp. [If] one plucks grass with dew on it in order to dampen wheat with it, that does not achieve BeKhi Yutan; but if he intended it for that, it achieves BeKhi Yutan. [If] one takes wheat to grind and rain falls on it, if he is happy [with this] it achieves BeKhi Yutan. Rabbi Yehudah says: It is impossible not to be happy, but if he stopped [it achieves BeKhi Yutan].

הַמְטַנֵּן בְּטִיט הַנָּגוּב, רַבִּי שִׁמְעוֹן אוֹמֵר, אִם יֶשׁ בּוֹ מַשְׁקֶה טוֹפֵחַ, בְּכִי יֻתַּן. וְאִם לָאו, אֵינוֹ בְּכִי יֻתַּן. הַמְרַבֵּץ אֶת גָּרְנוֹ, אֵינוֹ חוֹשֵׁשׁ שֶׁמָּא נָתַן בָּהּ חִטִּים וְטָנְנוּ. הַמְלַקֵּט עֲשָׂבִים כְּשֶׁהַטַּל עֲלֵיהֶם, לְהָטֵן בָּהֶם חִטִּים, אֵינָן בְּכִי יֻתַּן. אִם נִתְכַּוֵּן לְכָךְ, הֲרֵי זֶה בְכִי יֻתַּן. הַמּוֹלִיךְ חִטִּין לִטְחֹן וְיָרְדוּ עֲלֵיהֶן גְּשָׁמִים, אִם שָׂמַח, בְּכִי יֻתַּן. רַבִּי יְהוּדָה אוֹמֵר, אִי אֶפְשָׁר שֶׁלֹּא לִשְׂמֹחַ, אֶלָּא אִם עָמָד: