"but into your vessel you may not place them": when you are placing them into the vessel of the owner.
(Devarim 23:6) "If you come into the standing corn of your neighbor": I might think (that the verse speaks of) any man (who passes the standing corn); it is, therefore, written (Ibid.) "but you shall not lift a sickle" — when you are lifting a sickle (as a worker) upon your neighbor's standing corn.