Rashi on Exodus 12:16/רש"י על שמות י״ב:ט״ז

1מקרא קדש — The word מקרא is an infinitive and the translation is, “And on the first day there shall be “a calling it holy”, which implies: call it holy in regard to eating and drinking and raiment (Mekhilta).

2לא יעשה בהם NO WORK SHALL BE DONE ON THEM, even by the agency of others (cf. Mekhilta).

3הוא לבדו THAT ALONE — that and not such acts preliminary to it (to the preparation of food) as it was possible to do on the eve of the Festival (Beitzah 28b).

4לכל נפש BY EVERY BEING — even by cattle. One might think that also food may be prepared for non-Israelites! Scripture however states, (in this verse) לכם (i. e. לכל נפש לכם) for every being that belongs to you (the responsibility for feeding which belongs to you) (Mekhilta).