Exodus 34:22 English Standard Version Anglicised (ESVUK)
22 You shall observe the Feast of Weeks, the firstfruits of wheat harvest, and the Feast of Ingathering at the year's end.
Leviticus 23:9-21 English Standard Version Anglicised (ESVUK)
The Feast of Firstfruits
9 And the Lord spoke to Moses, saying, 10 “Speak to the people of Israel and say to them, When you come into the land that I give you and reap its harvest, you shall bring the sheaf of the firstfruits of your harvest to the priest, 11 and he shall wave the sheaf before the Lord, so that you may be accepted. On the day after the Sabbath the priest shall wave it. 12 And on the day when you wave the sheaf, you shall offer a male lamb a year old without blemish as a burnt offering to the Lord. 13 And the grain offering with it shall be two tenths of an ephah[a] of fine flour mixed with oil, a food offering to the Lord with a pleasing aroma, and the drink offering with it shall be of wine, a quarter of a hin.[b] 14 And you shall eat neither bread nor grain parched or fresh until this same day, until you have brought the offering of your God: it is a statute for ever throughout your generations in all your dwellings.
The Feast of Weeks
15 “You shall count seven full weeks from the day after the Sabbath, from the day that you brought the sheaf of the wave offering. 16 You shall count fifty days to the day after the seventh Sabbath. Then you shall present a grain offering of new grain to the Lord. 17 You shall bring from your dwelling places two loaves of bread to be waved, made of two tenths of an ephah. They shall be of fine flour, and they shall be baked with leaven, as firstfruits to the Lord. 18 And you shall present with the bread seven lambs a year old without blemish, and one bull from the herd and two rams. They shall be a burnt offering to the Lord, with their grain offering and their drink offerings, a food offering with a pleasing aroma to the Lord. 19 And you shall offer one male goat for a sin offering, and two male lambs a year old as a sacrifice of peace offerings. 20 And the priest shall wave them with the bread of the firstfruits as a wave offering before the Lord, with the two lambs. They shall be holy to the Lord for the priest. 21 And you shall make proclamation on the same day. You shall hold a holy convocation. You shall not do any ordinary work. It is a statute for ever in all your dwelling places throughout your generations.