יורה דעה צ״דYoreh De'ah 94

Se’if 1א׳

הַתּוֹחֵב כַּף חוֹלֶבֶת בִּקְדֵרָה שֶׁל בָּשָׂר, אוֹ אִיפְּכָא, מְשַׁעֲרִים בְּכָל מַה שֶּׁנִּתְחַב מִמֶּנּוּ בַּקְּדֵרָה אִם הַכַּף בֶּן יוֹמוֹ דְּהַיְנוּ שֶׁשִּׁמְּשׁוּ בּוֹ בִּכְלִי רִאשׁוֹן תּוֹךְ מֵעֵת לְעֵת. (אָרֹךְ כְּלָל ל"ז). וְיֵשׁ מִי שֶׁאוֹמֵר שֶׁאִם הַכַּף שֶׁל מַתֶּכֶת, מְשַׁעֲרִים בְּכֻלּוֹ, מִשּׁוּם דְּחַם מִקְצָתוֹ חַם כֻּלּוֹ. וּסְבָרָא רִאשׁוֹנָה עִקָּר, וְכֵן נוֹהֲגִין (מָרְדְּכַי וש"ד וְהַגָּהוֹתָיו וְאָרֹךְ) וְע"ל סי' צ"ח.

If one inserts a dairy spoon into a meat pot, or the opposite, we measure against all [the portion of the spoon] that was inserted into the pot (food itself) if the spoon was a ben yomo which is that it was used with a primary vessel [of heat] in the last 24 hours. And there are those who say that if the spoon is metal that we measure using the entire spoon because if part of it gets hot the entire thing gets hot. And the first opinion is the main one, and so too is our custom, and see above in chapter 98.

Se’if 2ב׳

אִם תָּחַב הַכַּף בַּקְּדֵרָה שְׁנֵי פְּעָמִים, וְלֹא נוֹדַע בֵּינְתַיִם, צָרִיךְ ב' פְּעָמִים שִׁשִּׁים. (וְיֵשׁ אוֹמְרִים דְּסָגֵי בְּפַעַם א' שִׁשִּׁים, וְכֵן נוֹהֲגִים (תְּרוּמַת הַדֶּשֶׁן סִימָן קפ"ג וְהַגָּהוֹת שַׁעֲרִי דּוּרָא וְאָרֹךְ).

If one inserted a spoon into a cooking vessel two times and did not know in the meantime, they need 60 times twice (the amount of food versus the spoon). There are those who say that it is sufficient to have 60 times (the amount) once. This is the custom.

Se’if 3ג׳

אִם יֵשׁ ס' לְבַטֵּל הַכַּף, הַקְּדֵרָה וְהַתַּבְשִׁיל מֻתָּרִים אֲבָל הַכַּף אָסוּר, בֵּין עִם בָּשָׂר בֵּין עִם חָלָב, לְפִי שֶׁהִיא בְּלוּעָה מִבָּשָׂר בְּחָלָב. וַאֲפִלּוּ בְּדִיעֲבַד אוֹסֶרֶת, אִם חָזְרוּ וּתְחָבוּהָ, בֵּין בְּבָשָׂר בֵּין בְּחָלָב, כָּל זְמַן שֶׁהִיא בַּת יוֹמָא. וְאִם אֵין ס', הַכֹּל אָסוּר בַּהֲנָאָה, אֲפִלּוּ הַקְּדֵרָה, אַךְ מֻתָּר לָתֵת לְתוֹכָהּ פֵּרוֹת אוֹ צוֹנֵן, כֵּיוָן שֶׁאֵינוֹ נֶהֱנֶה מִגּוּף הָאִסוּר.

If there is 60 times [the volume displacement of the spoon in the food] to negate [the taste in] the spoon, the vessel and the food are permitted but the spoon is prohibited, whether [the] spoon [is a] meat [spoon] or [a] dairy [spoon], since it [the spoon] has absorbed [the prohibited taste of] meat and milk. And even ex post facto it [the spoon] is prohibited, if one inserts [the spoon] again [into the food], whether in meat or in dairy, the entire time [that] it [the spoon] has been used within the past 24 hours. And if there is not 60 times [the volume displacement of the spoon in the food], everything [the spoon, the food, and the vessel] is prohibited [and one is prohibited] from deriving benefit [from the spoon, the food, or the vessel], even the vessel, although it is permitted to place within it [the vessel] fruits or cold [food items], since they do not benefit [i.e., absorb taste] from the prohibited body [i.e., the prohibited vessel].