Reference for Sheviit 4:8

הַבֹּסֶר, מִשֶּׁהֵבִיא מַיִם, אוֹכֵל בּוֹ פִּתּוֹ בַּשָּׂדֶה. הִבְאִישׁ, כּוֹנֵס לְתוֹךְ בֵּיתוֹ. וְכֵן כַּיּוֹצֵא בוֹ בִּשְׁאָר שְׁנֵי שָׁבוּעַ, חַיָּב בְּמַעַשְׂרוֹת:

The unripe grape, once it exudes liquid [when squeezed], one may eat one's bread with it in the field. Once it begins to ripen, one may gather it into one's house. And those similar to them [in stage of ripeness] during the other years [of the seven-year cycle] require tithes.

Jastrow

Jastrow