Reference for Mikvaot 6:6

גִּסְטְרָא שֶׁבַּמִּקְוֶה וְהִטְבִּיל בָּהּ אֶת הַכֵּלִים, טָהֲרוּ מִטֻּמְאָתָן, אֲבָל טְמֵאִים עַל גַּב כְּלִי חֶרֶס. אִם הָיוּ הַמַּיִם צָפִים עַל גַּבָּיו כָּל שֶׁהֵן, טְהוֹרִין. מַעְיָן הַיּוֹצֵא מִן הַתַּנּוּר וְיָרַד וְטָבַל בְּתוֹכוֹ, הוּא טָהוֹר וְיָדָיו טְמֵאוֹת. וְאִם הָיוּ עַל גַּבָּיו רוּם יָדָיו, אַף יָדָיו טְהוֹרוֹת:

If a jagged-edged [impure] earthenware vessel is in a <i>mikveh</i> [with its edges above the water's surface], and one immersed vessels in it, they are purified from their impurity [which they had before they were immersed], but they become impure due to [the protruding edges of] the earthenware vessel [which are impure and, as the immersed vessels emerge from the water but are still inside the space of the earthenware, render the water on them impure, which in turn renders those vessels impure]. If [however] any amount of water was floating above [the jagged edges], they are pure. A spring that flows [through and] out of an [impure] oven, of one descends and immerses in it, he is pure, but his hands are impure [since one's hands, but not one's body, are rendered impure by impure liquids, such as the liquid on his body once he emerges into the space of the impure oven]. If they [the spring's waters] rose above it [the oven] the height of his hands, even his hands are pure.

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