Numbers 28:26-31 Modern English Version (MEV)
Offerings at the Feast of Weeks
26 And on the day of the first fruits, when you bring a new grain offering to the Lord at your Feast of Weeks, you will have a holy assembly. You will do no ordinary work. 27 But you will offer the burnt offering as a pleasing aroma to the Lord: two young bulls, one ram, and seven lambs in their first year; 28 and their grain offering of flour mixed with oil, three-tenths of an ephah for one bull, two-tenths of an ephah for one ram, 29 one-tenth of an ephah for each of the seven lambs; 30 and one goat, to make an atonement for you. 31 Make sure they are without blemish. You will offer them with their drink offerings, besides the regular burnt offering and its grain offering.
Deuteronomy 16:9-12 Modern English Version (MEV)
The Feast of Weeks
9 You must count seven weeks for yourself. Begin counting the seven weeks from the time you begin to put the sickle to the standing grain. 10 You must keep the Feast of Weeks to the Lord your God with a tribute of a freewill offering from your hand, which you must give to the Lord your God, in proportion to how much the Lord your God has blessed you. 11 You shall rejoice before the Lord your God—you, your son, your daughter, your male servant, your female servant, the Levite who is within your gates, the foreigner, the orphan, and the widow who are among you—in the place where the Lord your God has chosen to place His name. 12 You must remember that you were a slave in Egypt, and you must be careful to observe these statutes.