The "Feast of the LORD" refers to the sacred festivals instituted by God for the Israelites, as detailed in the Old Testament. These feasts are outlined primarily in Leviticus 23 and are considered holy convocations, times set apart for worship, remembrance, and celebration. They serve as both historical commemorations and prophetic foreshadowings of future events in God's redemptive plan.

1. The Sabbath (Shabbat):
While not a feast in the sense of an annual event, the Sabbath is the foundational time of rest and worship, occurring weekly. Leviticus 23:3 states, "For six days work may be done, but the seventh day is a Sabbath of complete rest, a sacred assembly. You are not to do any work; wherever you live, it is a Sabbath to the LORD."

2. Passover (Pesach):
The Passover commemorates the Israelites' deliverance from slavery in Egypt. It begins on the 14th day of the first month (Nisan). Leviticus 23:5 notes, "The Passover to the LORD begins at twilight on the fourteenth day of the first month."

3. Feast of Unleavened Bread (Chag HaMatzot):
Following Passover, this seven-day feast involves eating unleavened bread, symbolizing the haste of the Israelites' departure from Egypt. Leviticus 23:6-8 describes, "On the fifteenth day of the same month begins the Feast of Unleavened Bread to the LORD. For seven days you must eat unleavened bread."

4. Feast of Firstfruits (Yom HaBikkurim):
This feast marks the beginning of the harvest season and involves offering the first sheaf of the barley harvest. Leviticus 23:10-11 instructs, "Speak to the Israelites and say, 'When you enter the land I am giving you and reap its harvest, you are to bring to the priest a sheaf of the firstfruits of your harvest.'"

5. Feast of Weeks (Shavuot or Pentecost):
Celebrated 50 days after the Feast of Firstfruits, this feast marks the end of the grain harvest and is associated with the giving of the Torah at Sinai. Leviticus 23:16 states, "You shall count fifty days until the day after the seventh Sabbath, and then present an offering of new grain to the LORD."

6. Feast of Trumpets (Yom Teruah or Rosh Hashanah):
This feast, occurring on the first day of the seventh month (Tishri), is marked by the blowing of trumpets and is a call to repentance. Leviticus 23:24-25 commands, "In the seventh month, on the first day of the month, you are to have a day of rest, a sacred assembly announced by trumpet blasts."

7. Day of Atonement (Yom Kippur):
A solemn day of fasting and repentance, the Day of Atonement is observed on the tenth day of the seventh month. Leviticus 23:27 declares, "The tenth day of this seventh month is the Day of Atonement. You are to hold a sacred assembly and humble yourselves, and present an offering made by fire to the LORD."

8. Feast of Tabernacles (Sukkot):
This seven-day feast, beginning on the 15th day of the seventh month, commemorates the Israelites' wilderness wanderings and God's provision. Leviticus 23:34-36 instructs, "On the fifteenth day of the seventh month, the LORD’s Feast of Tabernacles begins, and it continues for seven days."

9. The Eighth Day (Shemini Atzeret):
Following the Feast of Tabernacles, this day is a separate, solemn assembly. Leviticus 23:36 notes, "On the eighth day you are to hold a sacred assembly and present an offering made by fire to the LORD. It is a solemn assembly; you must not do any regular work."

These feasts are integral to the religious life of Israel, serving as reminders of God's past deliverance, His ongoing provision, and His future promises. They are deeply embedded in the Jewish calendar and hold significant theological implications for understanding God's covenant relationship with His people.