John Gill Commentary Exodus 23:12

"Six days thou shalt do thy work, and on the seventh day thou shalt rest; that thine ox and thine ass may have rest, and the son of thy handmaid, and the sojourner, may be refreshed." — Exodus 23:12 (ASV)

Six days you shall do your work
That is, they might do what work they would on the six days of the week:

and on the seventh day you shall rest ;
from all the work and labour done on other days, and give up themselves to religious exercises:

that your ox and your ass may rest ;
and so every other beast, as horses, camels

and the son of your handmaid, and the stranger, may be refreshed ;
the former, the Targum of Jonathan, and so Jarchi, interprets, of one uncircumcised, and the latter, of a proselyte of the gate: this law is here repeated, partly to show that it is of the same kind with the former, namely, ceremonial and temporary; and partly, as Jarchi observes, lest it should be said, since all, the year is called the sabbath, there was no need to observe the weekly sabbath.