[If] one sells his slave to a gentile or to [someone] outside Eretz Yisrael, he goes free. Captives may not be redeemed for more than their value, for the sake of the general good. And captives may not be helped to escape, for the sake of the general good. Rabban Shimon ben Gamliel says: For the benefit of the captives. Torah scrolls, phylacteries, and mezuzos may not be bought from gentiles for more than their value, for the sake of the general good.