10“Speak to the Israelites and say, ‘When you enter the land that I am giving you and you reap its harvest, you are to bring to the priest a sheaf of the firstfruits of your harvest.
11And he shall wave the sheaf before the LORD so that it may be accepted on your behalf; the priest is to wave it on the day after the Sabbath.
12On the day you wave the sheaf, you shall offer a year-old lamb without blemish as a burnt offering to the LORD,
13along with its grain offering of two-tenths of an ephah of fine flour mixed with oil — an offering made by fire to the LORD, a pleasing aroma — and its drink offering of a quarter hin of wine.
14You must not eat any bread or roasted or new grain until the very day you have brought this offering to your God. This is to be a permanent statute for the generations to come, wherever you live.
15From the day after the Sabbath, the day you brought the sheaf of the wave offering, you are to count off seven full weeks.
16You shall count off fifty days until the day after the seventh Sabbath, and then present an offering of new grain to the LORD.
— Leviticus 23:10-16