Related do Pea 5:9

[There are] four gifts [for the poor] from the vineyards: Peret (i.e., grapes that fall during harvesting, see Lev. 19:10, Peah 7:3), forgotten sheaves (Deut. 24:19), peah (Lev. 23:22), and olelet (i.e., defective clusters, see Lev. 19:10, Peah 7:4). [There are] three [gifts for the poor] from field-produce: Gleanings (Lev. 19:9), forgotten sheaves, and peah. [There are] two [gifts for the poor] from fruit trees: forgotten sheaves and peah. [And as to] all of these, they should not [be given as] a favor, and [others] can even take [gifts for the poor given as a favor] from a Jewish poor person from his hand (i.e., since it does not lawfully belong to him in the first place). And [as to] the remainder of the priestly gifts, such as the shankbone and the jawbone and the rough-stomach (see Deut. 18:3), these may be [given as] a favor. And we give [these] to every Kohen that desires [them].

[If a poor worker] received [a one time job] to harvest a field, [then] his son cannot glean [the gifts to the poor right] after him [before other poor people will have a chance to glean that field]. Rebbi Yossi says, “His son may glean after him.” But sharecroppers, and [regular] tenants, and a person who sells his standing crops to his friend in order [that his friend should] harvest them, [in all of these cases] his (i.e. the sharecropper’s, or tenant’s, or friend’s) son can glean [the gifts to the poor right] after him [before other poor people will have a chance to glean that field]. If there were [in the field] poor people who are not fitting [to be allowed] to glean [the gifts to the poor, then] if the owner of the field can prevent them [from gleaning], he is allowed to do so, but if [he is] not [able to prevent them from gleaning, then] he should leave them alone [and let them glean anyway] because of peaceful relations [between people].

[If] the owner [of the field] was standing in the city and he said, “I know that [my] workers are forgetting a sheaf in such and such a place [in the field],” and they (i.e. workers) [really] forgot it [there, then] it is not [considered to be] Shikcha (forgotten sheaves), [because the owner still knows about it and did not forget it]. Rebbi Shimon Ben Yehuda says in the name of Rebbi Shimon, “Even if other people were passing by on the road [next to the field] and they saw the sheaf that they (i.e. workers) have forgotten, it is not [considered to be] Shikcha until it gets forgotten by all people, [including the passersby.]”