Leviticus 23:28-32

28You shall not do any work on this very day, for it is a 1Day of Atonement, 2to make atonement on your behalf before the Lord your God. 29If there is any 3person who does not humble himself on this very day, 4he shall be cut off from his people. 30As for any person who does any work on this very day, that person I will eliminate from among his people. 31You shall not do any work. It is to be a permanent statute throughout your generations in all your dwelling places. 32It is to be a Sabbath of complete rest for you, and you shall humble 5yourselves; on the ninth of the month at evening, from evening until evening, you shall keep your Sabbath.”