And what does the Torah mean by "ke'Sachir ke'Toshav Yih'yeh Imach"?
Rashi: It means that one should employ him to work in the field or to perform the work of a craftsman, like other hired workers.
Ramban #2 (citing the Toras Kohanim): 'Just as a Sachir, is paid day by day, 3 so too, should you pay him (the Eved Ivri) day by day; and just as a Toshav "(Do for him) whatever is beneficial for him; Do not taunt him!", 4 so too, should you do for him ... '. "Yih'yeh Imach", 'Imach be'Ma'achal, Imach be'Mishtah, Imach bi'Kesus Nekiyah (fine clothes)'.
Seforno: It means that you should treat him like a Sachir (a hired worker) - if he is acquired for six years, you should treat him like a short-term Sachir (for one year), whereas if he is acquired until the Yovel, you should treat him like a long-term Sachir (a Toshav [for many years]).
Bearing in mind that an Eved Ivri works for six years (as we learned at the beginning of Mishpatim), what does the Pasuk mean when it writes "Ad Sh'nas ha'Yovel Ya'avod Imach"?