Albert Barnes Commentary Leviticus 25:28

"But if he be not able to get it back for himself, then that which he hath sold shall remain in the hand of him that hath bought it until the year of jubilee: and in the jubilee it shall go out, and he shall return unto his possession." — Leviticus 25:28 (ASV)

It shall go out - that is, it shall be set free.