What are the ramifications of "Ge'ulah Tihyeh Lo"?
Da'as Zekenim (Al Derech Derush): After Yisrael were exiled, Hashem will redeem them. He is Echad, and Yisrael's brother
On what grounds can one expect the Nochri to comply?
Rashi (from Kidushin 15b): The Pasuk discusses a Nochri who is under our jurisdiction. 1
Riva (from Kidushin 15b): This is logical. If not what can we do? (The slave will go free only when his master wants to free him!) Moshav Zekenim (50, citing Ri) asked why a verse is needed to teach this. (What is his source to say that this is learned from a verse?
Why is the current Halachah not obvious?
Seforno (citing Kidushin, 20b): We might otherwise have thought that, since the Eved went and became a priest to Avodah-Zarah, we leave him where he is.
Rashi: Even though he goes out in Yovel, redeem him immediately.
QUESTIONS ON RASHI
Rashi writes that even though we discuss a Nochri under our jurisdiction, one must redeem for the proper amount. There is an opinion that permits Gezel Nochri!
Moshav Zekenim (44, citing Riva): Since the Nochri benefited the slave and gave to him money [when he bought him], there is more concern for Chilul Hashem than in a normal case of Gezel Nochri.