Reference for Temurah 1:4

אֵין הַמְדֻמָּע מְדַּמֵּעַ אֶלָּא לְפִי חֶשְׁבּוֹן. אֵין הַמְחֻמָּץ מְחַמֵּץ אֶלָּא לְפִי חֶשְׁבּוֹן. אֵין הַמַּיִם הַשְּׁאוּבִים פּוֹסְלִין אֶת הַמִּקְוֶה אֶלָּא לְפִי חֶשְׁבּוֹן:

<i>Meduma</i> (a mixture of <i>terumah</i> and non-sacred food) does not render [its admixture] <i>meduma</i> except according to reckoning [i.e., the amount of <i>terumah</i> in the initial mixture], and leavened foodstuffs [leavened by leavening which is <i>terumah</i>] does not render [its admixture] <i>chamets</i> except according to reckoning, and drawn water does not render a <i>mikveh</i> invalid except according to reckoning.

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