This reading is from the special Torah reading for the first two days of Sukkot. The complete Torah reading for these days is Leviticus 22:26-23:44 and Numbers 29:12-16.
These are the set times of the Lord, the sacred occasions, which you shall celebrate each at its appointed time: In the first month, on the fourteenth day of the month, at twilight, there shall be a passover offering to the Lord, and on the fifteenth day of that month the Lord's Feast of Unleavened Bread. You shall eat unleavened bread for seven days. On the first day you shall celebrate a sacred occasion: you shall not work at your occupations. Seven days you shall make offerings by fire to the Lord. The seventh day shall be a sacred occasion: you shall not work at your occupations.
The Lord spoke to Moses, saying: Speak to the Israelite people and say to them:
When you enter the land that I am giving to you and you reap its harvest, you shall bring the first sheaf of your harvest to the priest. He shall elevate the sheaf before the Lord for acceptance in your behalf; the priest shall elevate it on the day after the sabbath. On the day that you elevate the sheaf, you shall offer as a burnt offering to the Lord a lamb of the first year without blemish. The meal offering with it shall be two-tenths of a measure of choice flour with oil mixed in, an offering by fire of pleasing odor to the Lord; and the libation with it shall be of wine, a quarter of a hin. Until that very day, until you have brought the offering of your God, you shall eat no bread or parched grain or fresh ears; it is a law for all time throughout the ages in all your settlements.