Leviticus 23:5-14

5 aIn the first month, on the fourteenth day of the month at twilight,
Hebrew between the two evenings
is the Lord’s Passover.
6And on the fifteenth day of the same month is the Feast of Unleavened Bread to the Lord; for seven days you shall eat unleavened bread. 7 cOn the first day you shall have a holy convocation; you shall not do any ordinary work. 8But you shall present a food offering to the Lord for seven days. On the seventh day is a holy convocation; you shall not do any ordinary work.”

The Feast of Firstfruits

9And the Lord spoke to Moses, saying, 10Speak to the people of Israel and say to them, dWhen you come into the land that I give you and reap its harvest, you shall bring the sheaf of ethe firstfruits of your harvest to the priest, 11and he shall fwave 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 gwave the sheaf, you shall offer a hmale lamb a year old without blemish as a burnt offering to the Lord. 13 iAnd 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, kand 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 mparched or nfresh 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.

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