Numbers 28:24-26

New International Version - UK

²⁴ In this way present the food offering every day for seven days as an aroma pleasing to the Lord; it is to be offered in addition to the regular burnt offering and its drink offering. ²⁵ On the seventh day hold a sacred assembly and do not do any ordinary work.

The Festival of Weeks

²⁶ ‘“On the day of firstfruits, when you present to the Lord an offering of new grain during the Festival of Weeks, hold a sacred assembly and do not do any of your ordinary work.