Reference for Makhshirin 5:8

קַסְיָא שֶׁל שֻׁלְחָנוֹת וְהַשִּׁיפָא שֶׁל לְבֵנִים, אֵינָן בְּכִי יֻתַּן. וְאִם נִעֵר, בְּכִי יֻתַּן:

A table cover and the matting used [to cover] bricks do not achieve <i>BeKhi Yutan</i> [if water that fell on them subsequently fell on food]. And if he shakes them [to wash them] - that does achieve <i>BeKhi Yutan</i>.

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