משנה על מעשר שני 5:1

[The produce of] a vineyard in its fourth year was brought up to Jerusalem within a distance of one day’s journey on each side. And what is the border [of a day’s journey on each side]? Eilat to the south, Akrabat on the north, Lod to the west, and the Jordan [river] to the east. When produce increased, it was decreed that it can be redeemed even if the vineyard was close to the wall. And there was a stipulation on this matter, that whenever it was so desired, the arrangement would be restored as it had been before. Rabbi Yose says: this was the stipulation after the Temple was destroyed, and the stipulation was that when the Temple should be rebuilt the arrangement would be restored as it had been before.

[The grapes of] a vineyard in its fourth year:Bet Shammai says: the laws of the added fifth and removal do not apply to them; But Bet Hillel says: they do. Bet Shammai says: the laws of peret and the defective clusters apply to them, and the poor can redeem the grapes for themselves. But Bet Hillel says: all [of them] go to the wine-press.

How does one redeem the fruit of a plant in its fourth year? The owner puts down a basket in the presence of three [people] and says: “How many such baskets would a man wish to redeem for himself for a sela on condition that the costs [to produce the fruit] shall be on his house? And then he puts down the money and says: “Whatever shall be picked from this plant may it be exchanged for this money at the price of so many baskets for a sela.”