Keilim3: 1
[א] שִׁעוּר כְּלִי חֶרֶס לִטַּהֵר: הֶעָשׂוּי לָאֳכָלִין — שִׁיעוּרוֹ בַּזֵּיתִים: הֶעָשׂוּי לַמַּשְׁקִין — שִׁיעוּרוֹ בַּמַּשְׁקִין; הֶעָשׂוּי לְכָךְ וּלְכָךְ — מַטִּילִין אוֹתוֹ לְחֻמְרוֹ בַּזֵּיתִים.
The measure [of a hole] that will render an earthenware utensil tahor [is as follows]: That which was intended for food, its measure is with olives; that which was intended for liquids, its measure is with liquids; with that which was intended for both [food] and [liquids], we apply to it the more stringent [measure] of olives.