פירוש על קידושין 30:1

Leviticus 25:54 refers to an Israelite sold to a Gentile. The Torah says that he may be redeemed by his relative. Rabbi [Judah Hanasi] rules that he does not go free after six years. Rabbi points out that we might have made a kal vehomer from a Hebrew slave sold to a Jew. He cannot be redeemed by his relatives and yet he does go free at six years. This proves that Rabbi does not learn from the repetition of the word “sakhir” for the word “sakhir” is used in both the context of a Jew sold to Gentiles and a Jew sold to other Jews. If Rabbi learned from “sakhir” then both types of slaves could be redeemed by their relatives.