Reference for Kilayim 7:5

אָמַר רַבִּי יוֹסֵי, מַעֲשֶׂה בְּאֶחָד שֶׁזָּרַע אֶת כַּרְמוֹ בַּשְּׁבִיעִית, וּבָא מַעֲשֶׂה לִפְנֵי רַבִּי עֲקִיבָא, וְאָמַר, אֵין אָדָם מְקַדֵּשׁ דָּבָר שֶׁאֵינוֹ שֶׁלּוֹ:

Rabbi Yosi said, It once happened that a man sowed grains in his vineyard during the Sabbatical Year and the case came before Rabbi Akivah, who said, A man cannot render forbidden that which was not belong to him [and during the Sabattical Year all produce is ownerless and thus not his].

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