Jerusalem Talmud Pesachim 4.2

משנה: כַּיּוֹצֵא בוֹ הַמּוֹלִיךְ פֵּירוֹת שְׁבִיעִית מִמְּקוֹם שֶׁכָּלוּ לִמְקוֹם שֶׁלֹּא כָלוּ אוֹ מִמְּקוֹם שֶׁלֹּא כָלוּ לִמְקוֹם שֶׁכָּלוּ חַיָיב לְבָעֵר. רִבִּי יְהוּדָה אוֹמֵר צֵא וְהָבֵא לָךְ אַף אָתָּה:

MISHNAH: Similarly, he who brings Sabbatical produce from a place where it was exhausted to one where it was not exhausted or from a place where it was not exhausted to one where it was exhausted is obligated to eliminate. Rebbi Jehudah says, go and get it for yourself.

הלכה: כָּלוּ מִטִּיבֵּרִיָּה וְלֹא כָלוּ מִצִּיפּוֹרִין. אָמַר לֹו. מִצִּיפּוֹרִין הֵבֵאתִים. אִם אֵין אַתְּ מַאֲמִינֵנִי צֵא וְהָבֵא לָךְ אַף אָתָּה. רִבִּי חֲנַנְיָה וְרִבִּי פִינְחָס. רִבִּי יוּדָה וְרִבִּי יוֹסֵה שְׁנֵיהֶן אָמְרוּ דָבָר אֶחָד. דְּתַנִּינָן תַּמָּן. אוֹכְלִין עַל הַמּוּבְקָר וְאֵין אוֹכְלִין עַל הַשָּׁמוּר. רִבִּי יוֹסֵי אוֹמֵר. אַף עַל הַשָּׁמוּר. אָמַר לוֹן. מִן הַשָּׁמוּר הֵבֵאתִים. וְאִם אֵין אַתְּ מַאֲמִינִי הֲרֵי שָׁדֶה פְלוֹנִית מְשׁוּמֶּרֶת לְפָנֶיךָ. צֵא וְהָבֵא לָךְ אַף אָתָּה.

HALAKHAH: If they run out in Tiberias but did not run out in Sepphoris. He says to him, 1 brought it from Sepphoris; if you do not believe me, go and bring for yourself. Rebbi Ḥanania and Rebbi Phineas: Rebbi Jehudah and Rebbi Yose both said the same, as we have stated there: “One eats based on what is abandoned but not on what is guarded. Rebbi Yose says, also on what is guarded.” He says to him, I brought it from what is guarded; if you do not believe me, there is field x guarded before you, go and bring for yourself.