Leviticus 23:15-21 New Revised Standard Version (NRSV)
The Festival of Weeks
15 And from the day after the sabbath, from the day on which you bring the sheaf of the elevation offering, you shall count off seven weeks; they shall be complete. 16 You shall count until the day after the seventh sabbath, fifty days; then you shall present an offering of new grain to the Lord. 17 You shall bring from your settlements two loaves of bread as an elevation offering, each made of two-tenths of an ephah; they shall be of choice flour, baked with leaven, as first fruits to the Lord. 18 You shall present with the bread seven lambs a year old without blemish, one young bull, and two rams; they shall be a burnt offering to the Lord, along with their grain offering and their drink offerings, an offering by fire of pleasing odor to the Lord. 19 You shall also offer one male goat for a sin offering, and two male lambs a year old as a sacrifice of well-being. 20 The priest shall raise them with the bread of the first fruits as an elevation offering before the Lord, together with the two lambs; they shall be holy to the Lord for the priest. 21 On that same day you shall make proclamation; you shall hold a holy convocation; you shall not work at your occupations. This is a statute forever in all your settlements throughout your generations.