Tossefta sur La Genèse 49:27

They may eat [Shevi'it produce] in the King's palace until [that species] can no longer be found in Beth El. Even though there is no proof of the matter, there is a hint of the matter (Gen. 49:27, JPS tr.): "Benjamin is a ravenous wolf" -- this is the land that he seized; "In the morning he consumes the foe" -- this is Jericho, which is the earliest [to no longer have produce in the field]; "And in the evening he divides the spoil" -- this is Beth El, which is the latest. ]" This is the land that he seized in the morning." One may eat purslane until the agotrei (vegetables used for fish sauce) are gone [from the field]. And the residents of the Upper Galilee until lofsei [are gone from the field]. [And the residents of] Beit Dagan and adjacent areas in the Lower Galilee until the ahina (=אֲהִינָא, a species of late and inferior dates, see Jastrow) [are gone from the field] of Ma'an Ana.