Rashi on Leviticus 25:44/רש"י על ויקרא כ״ה:מ״ד

1ועבדך ואמתך אשר יהיו לך BUT THY MAN-SERVANT AND THY MAID-SERVANT WHO MAY BE THINE [SHALL BE OF THE NATIONS THAT ARE ROUND ABOUT YOU] — If you should say, “But if this be so (that I must treat my Jewish servant with so much regard), by whom shall I be served? Over my Jewish servants I have no power; of the Canaanite people I cannot possess any for You have warned me, (Deuteronomy XX 16) “Thou shalt keep alive any soul"! Who then shall serve me?” Then I reply —

2מאת הגוים OF THE OTHER NATIONS — they may be servants to you.

3אשר סביבתיכם [THE NATIONS] WHO ARE ROUND ABOUT YOU — not, however, those who live within the boundaries of your land; for with regard to them I have indeed told you, “Thou shalt keep alive no soul” (Sifra, Behar, Section 6 3).