Sefer HaMitzvot, Negative Commandments
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הזהיר שלא למכור אמה עבריה לזולתנו. והתבארו משפטי מצוה זו בפ"א מקדושין. (משפטים, הלכות עבדים פ"י):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That He prohibited us - that we not sell a Hebrew (Jewish) maidservant to someone besides ourselves. And the regulations of this commandment have been explained in Chapter 1 of Kiddushin. (See Parashat Mishpatim; Mishneh Torah, Slaves 10.)