Midrash su Levitico 25:28

5) (Vayikra 25:28) ("And if his hand does not find what suffices to restore it to himself, then his selling shall remain in the hand of its buyer until the year of Yovel, and it shall go out on the Yovel, and he shall return to his holding.") "And if his hand does not find": What is the intent of this? If it does not apply to the owner of the field, (this already having been stated [28:26, etc.]), learn it as applying to the redeemer, that he redeem in this order: If his hand does not find, etc., he shall not sell a distant field to redeem one that is close, what is inferior to redeem what is superior. "his hand": He shall not borrow and redeem. "what suffices to restore it": that he not redeem by parts.

6) "then his selling shall remain in the hand of its buyer until the year of Yovel": The foregoing does not apply to a field which was consecrated (by the buyer) until Yovel. (In that instance) he may sell what is distant to redeem what is close and what is inferior to redeem what is superior, and he may borrow to redeem, and he may redeem in parts.

7) R. Shimon said: Why is this (the above) so? Because with mundane (property), if Yovel arrived and it had not been redeemed, it returns (to the original owner), but with sacred property, if Yovel arrived and it had not been redeemed, it remains in perpetuity to the owners (i.e., the Cohanim, and the original owner loses it). "until the year of Yovel": (immediately at the end of the year) that it (Yovel) not enter at all. In sum: Fields (of holding on Yovel) and money (on shemitah) are released as one (on the very end of the seventh year); Yovel releases at its beginning, and shevi'ith, at its end; and it (the field) goes out (to the original owner) on Yovel — even that which was redeemed. "and he shall return to his holding": (anyone who has a holding,) including a woman.