Reference for Kelim 3:1

שִׁעוּר כְּלִי חֶרֶס לִטַּהֵר, הֶעָשׂוּי לְאֳכָלִין, שִׁעוּרוֹ בְזֵיתִים. הֶעָשׂוּי לְמַשְׁקִין, שִׁעוּרוֹ בְמַשְׁקִין. הֶעָשׂוּי לְכָךְ וּלְכָךְ, מַטִּילִין אוֹתוֹ לְחֻמְרוֹ בְזֵיתִים:

The measure of [a hole in] a clay vessel to make it pure, if it is used for foods, its measure is with olives. If it is used for liquids, its measure is with liquids. If it is used for this [foods] and for that [liquids], they impose the stringent ruling on it, with olives.

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