Leviticus 23:10-17

10Speak to the people of Israel and say to them, a  When you come into the land that I give you and reap its harvest, you shall bring the sheaf of b  the firstfruits of your harvest to the priest, 11and he shall c  wave the sheaf before the  Lord, so that you may be accepted. On the day after the Sabbath the priest shall wave it. 12And on the day when you d  wave the sheaf, you shall offer a e  male lamb a year old without blemish as a burnt offering to the  Lord. 13 f  And the grain offering with it shall be two tenths of an ephah
An  ephah was about 3/5 bushel or 22 liters
of fine flour mixed with oil, a food offering to the  Lord with a pleasing aroma h  and the drink offering with it shall be of wine, a fourth of a hin.
A  hin was about 4 quarts or 3.5 liters
14And you shall eat neither bread nor grain j  parched or k  fresh until this same day, until you have brought the offering of your God: it is a statute forever throughout your generations in all your dwellings.

The Feast of Weeks

15 l  “You shall count seven full weeks from the day after the Sabbath, from the day that you brought the sheaf of the m  wave offering. 16You shall count n  fifty days to the day after the seventh Sabbath. Then you shall present a grain offering of o  new grain to the  Lord. 17You 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 p  firstfruits to the  Lord.
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