Reference for Makhshirin 5:5

פָּשַׁט יָדוֹ אוֹ רַגְלוֹ אוֹ קָנֶה לְבוֹר לֵידַע אִם יֶשׁ בּוֹ מַיִם, אֵינָן בְּכִי יֻתַּן. לֵידַע כַּמָּה מַיִם יֶשׁ בּוֹ, הֲרֵי זֶה בְכִי יֻתַּן. זָרַק אֶבֶן לְבוֹר לֵידַע אִם יֶשׁ בּוֹ מַיִם, הַנִּתָּזִין, אֵינָן בְּכִי יֻתַּן. וְאֶת שֶׁבָּאֶבֶן, טְהוֹרִים:

[If] one reaches out his hand or his leg, or a rod into a cistern to see if there is water in it, that does not that does achieve <i>BeKhi Yutan</i>; [it it is] to see how much water is in it that does achieve <i>BeKhi Yutan</i>. [If] one throws a rock into a cistern to see if there is water in it that which splashes out does not achieve <i>BeKhi Yutan</i>, and that which is on the rock is pure [that is, does not make food susceptible to impurity].

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