And on the seventh day you shall have a holy convocation. You shall do no customary work.
Numbers 28:25
Surrounding context
28:24 In this manner you shall offer the food of the offering made by fire daily for seven days, as a sweet aroma to the LORD; it shall be offered besides the regular burnt offering and its drink offering.
28:25 And on the seventh day you shall have a holy convocation. You shall do no customary work.
28:26 "Also on the day of the firstfruits, when you bring a new grain offering to the LORD at your Feast of Weeks, you shall have a holy convocation. You shall do no customary work.