Leviticus 23:9-16

9And the LORD spoke to Moses, saying, 10Speak to the children of Israel, and say to them, When ye shall have come into the land which I give to you, and shall reap its harvest, then ye shall bring a sheaf of the firstfruits of your harvest to the priest:1 11And he shall wave the sheaf before the LORD, to be accepted for you: on the next day after the sabbath the priest shall wave it. 12And ye shall offer that day when ye wave the sheaf a male lamb without blemish of the first year for a burnt offering to the LORD. 13And its meat offering shall be two tenth parts of fine flour mixed with oil, an offering made by fire to the LORD for a sweet savour: and its drink offering shall be of wine, the fourth part of an hin. 14And ye shall eat neither bread, nor roasted grain, nor new growth, until the same day that ye have brought an offering to your God: it shall be a statute for ever throughout your generations in all your dwellings.

15And ye shall count to you from the next day after the sabbath, from the day that ye brought the sheaf of the wave offering; seven sabbaths shall be complete: 16Even to the next day after the seventh sabbath shall ye number fifty days; and ye shall offer a new meat offering to the LORD.