(Mishnah): If Shimon's slave was captured, and Reuven redeemed him l'Shem Eved (in order that he should be a slave), he serves [like a slave];

If he redeemed him l'Shem Ben Chorin (in order that he be free), he does not serve.

R. Shimon ben Gamliel says, in either case, he serves.

If one made his slave an Apotiki (collateral for a loan; he promised the lender that he may collect the slave) and he freed him, letter of the law, he owes nothing to his master;

However, due to Tikun ha'Olam, we force the master to free him, and [the slave] writes a document [obligating himself to pay to his master] his value;

R. Shimon ben Gamliel says, only the one who freed him writes.

(Gemara -R. Avahu citing Chizkiyah) Opinion #1: According to letter of the law, even if [he redeemed him] l'Shem Eved, he should not serve;

Why did [Chachamim] say that he serves? It is lest a slave uproot himself from his master and flee to captors.

Support (R. Ze'ira - Beraisa): His master pays his value [to the one who redeemed him, and he serves his master. He serves] only his master, but not someone else [lest he flee to captors to escape his master, e.g. if he does not like his master.]

Opinion #2 (R. Ila citing R. Yosa): According to letter of the law, even if [he redeemed him] l'Shem Ben Chorin, he serves;

Why did [Chachamim] say that he does not serve? It is lest people degrade Bnei Chorin.

Support: (R. Yosi - Beraisa - R. Shimon ben Gamliel): In either case, he serves. Just like Yisrael are commanded to redeem Bnei Chorin, they are commanded to redeem slaves.

Inference: The first Tana holds that they are commanded to redeem Bnei Chorin, but they are not commanded to redeem slaves. (When one redeems l'Shem Ben Chorin, he decrees that he not serve, for if he serves, people will not redeem him. We explained this based on SEFER HA'ZECHUS.)

(R. Yakov bar Idi citing Reish Lakish): The Halachah follows R. Shimon ben Gamliel.