Reference for Maaser Sheni 5:9
מִי שֶׁהָיוּ פֵרוֹתָיו רְחוֹקִים מִמֶּנּוּ, צָרִיךְ לִקְרוֹא לָהֶם שֵׁם. מַעֲשֶׂה בְרַבָּן גַּמְלִיאֵל וְהַזְּקֵנִים שֶׁהָיוּ בָאִין בִּסְפִינָה, אָמַר רַבָּן גַּמְלִיאֵל, עִשּׂוּר שֶׁאֲנִי עָתִיד לָמוֹד, נָתוּן לִיהוֹשֻׁעַ, וּמְקוֹמוֹ מֻשְׂכָּר לוֹ. עִשּׂוּר אַחֵר שֶׁאֲנִי עָתִיד לָמֹד, נָתוּן לַעֲקִיבָא בֶן יוֹסֵף שֶׁיִּזְכֶּה בוֹ לָעֲנִיִּים, וּמְקוֹמוֹ מֻשְׂכָּר לוֹ. אָמַר רַבִּי יְהוֹשֻׁעַ, עִשּׂוּר שֶׁאֲנִי עָתִיד לָמוֹד נָתוּן לְאֶלְעָזָר בֶּן עֲזַרְיָה, וּמְקוֹמוֹ מֻשְׂכָּר לוֹ. וְנִתְקַבְּלוּ זֶה מִזֶּה שָׂכָר:
Someone whose produce was far away from him, must announce for them a designation. It happened that Rabban Gamliel and the elders were traveling by ship. Rabban Gamliel said: the tenth that I will measure in the future is given to Yehoshua and its location is rented to him. Another tenth that I will measure in the future is given to Akiva ben Yosef so that he will receive it on behalf of the poor and its location is rented to him. Rabbi Yehoshua said: The tenth that I will measure in the future is given to Elazar ben Azaria and its location is rented to him. And they each received payment from the other.