15אַף עַל פִּי שֶׁהַבִּכּוּרִים וְהַתְּרוּמוֹת אָסוּר לְהֵאָכֵל לְזָרִים וְאַף עַל פִּי שֶׁהַבִּכּוּרִים עוֹלִין בְּאֶחָד וּמֵאָה כִּתְרוּמָה אִם נִתְעָרְבוּ בְּחֻלִּין בִּירוּשָׁלַיִם אֲסוּרִין בְּכָל שֶׁהֵן בְּמִינָם כְּמַעֲשֵׂר שֵׁנִי. מִפְּנֵי שֶׁהוּא מְקוֹם אֲכִילָתָן עֲשָׂאוּם כְּדָבָר שֶׁיֵּשׁ לוֹ מַתִּירִין. וְאַף עַל פִּי שֶׁהַבִּכּוּרִים אֲסוּרִים לְזָרִים אַף בִּירוּשָׁלַיִם הֲרֵי הֵן אוֹסְרִין בְּכָל שֶׁהֵן. אֲפִלּוּ זָרַע הַבִּכּוּרִים אַחַר שֶׁנִּכְנְסוּ לִירוּשָׁלַיִם הֲרֵי הַגִּדּוּלִין אֲסוּרִין וְאוֹסְרִין בְּכָל שֶׁהֵן אִם נִתְעָרְבוּ בִּירוּשָׁלַיִם. אֲבָל הַזּוֹרֵעַ בִּכּוּרִים קֹדֶם שֶׁיִּכָּנְסוּ לִירוּשָׁלַיִם הַגִּדּוּלִין חֻלִּין:
The first fruits and the terumot are forbidden to be eaten by non-priests. [Generally,] when the first fruits are mixed with ordinary produce, they are permitted if there is 101 times the original amount as is the law with regard to terumah. Nevertheless, if they become mixed with the same species of ordinary produce in Jerusalem, [the mixture] is forbidden even if the slightest amount of [the first fruits are mixed in] as [is the law regarding] the second tithe. [The rationale is that] since [they are located in Jerusalem,] the place where one partakes of them, they are considered like an entity that could become permitted. Although the first fruits are forbidden to non-priests even in Jerusalem, nevertheless, even the slightest presence of them in a mixture causes it to be forbidden. Even if one sowed the first fruits after they were brought to Jerusalem, even the slightest amount of produce that grows from them causes a mixture to become forbidden. If, however, one sows the first fruits before they were brought to Jerusalem, the produce that grows from them is ordinary produce.
