No servile work - literally, no work of labor, no work that belongs to one's worldly calling, such as labor in agriculture or handicraft. The preparation of food was permitted Exodus 12:16, a licence not granted on the weekly Sabbath, or on the day of atonement Leviticus 23:28, Leviticus 23:30; Exodus 20:10; Exodus 35:3.

In the first day ye shall have an holy convocation: ye shall do no (b) servile work therein.
(b) Or, bodily labour, save about that which one must eat, (Exodus 12:16).

In the first day ye shall have an holy convocation,.... That is, on the first of the seven days of the feast of unleavened bread, even the fifteenth day of the month Nisan; this was separated from the other days of the festival, and more particularly devoted to religions exercises, see Exodus 12:16,
ye shall do no servile work therein; such as agriculture, or any manufacture or mechanical business, which they and their servants were at other times employed in; but they might bake bread, and boil or roast their meat, and walk abroad, which they might not do on their sabbaths; and therefore it is so expressed as to distinguish it from the work forbidden on that day.