Leviticus 23:28

28 And you shall not do any work on this same day, for it is a ^aday of atonement, ^bto make atonement on your behalf before Yahweh your God.

Leviticus 23:30

30 And as for any person who does any work on this same day, that person I will cause to perish from among his people.

31 You shall do no work at all. It is to be a perpetual statute throughout your generations in all your places of habitation.