The set feasts instituted by Moses hold significant importance in the religious and cultural life of ancient Israel, as outlined in the Torah. These feasts, also known as the "appointed times," were divinely ordained celebrations that served as both commemorative and prophetic events, reflecting God's covenant relationship with His people. The primary set feasts include the Passover, the Feast of Unleavened Bread, the Feast of Weeks (Pentecost), the Feast of Trumpets, the Day of Atonement, and the Feast of Tabernacles.

1. Passover (Pesach): The Passover is the first of the set feasts and commemorates the Israelites' deliverance from slavery in Egypt. Instituted in Exodus 12, it involves the sacrifice of a lamb and the application of its blood on the doorposts, symbolizing God's protection. "This day is to be a memorial for you, and you are to celebrate it as a feast to the LORD. You are to celebrate it as a permanent statute for the generations to come" (Exodus 12:14).

2. Feast of Unleavened Bread (Chag HaMatzot): Immediately following Passover, this seven-day feast emphasizes the haste of the Israelites' departure from Egypt, during which they ate unleavened bread. It serves as a reminder of purity and separation from sin. "For seven days you must eat unleavened bread. On the first day, you are to remove the leaven from your houses" (Exodus 12:15).

3. Feast of Weeks (Shavuot or Pentecost): Celebrated fifty days after the Feast of Firstfruits, this feast marks the end of the grain harvest and is associated with the giving of the Law at Mount Sinai. It is a time of thanksgiving and offering of firstfruits. "You are to count off seven full weeks from the day after the Sabbath, the day you brought the sheaf of the wave offering" (Leviticus 23:15).

4. Feast of Trumpets (Yom Teruah or Rosh Hashanah): This feast marks the beginning of the civil year and is characterized by the blowing of trumpets. It serves as a call to repentance and preparation for the Day of Atonement. "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" (Leviticus 23:24).

5. Day of Atonement (Yom Kippur): The most solemn of the feasts, this day is dedicated to atonement and repentance. The high priest enters the Holy of Holies to make atonement for the sins of the people. "This is to be a permanent statute for you: On the tenth day of the seventh month, you must humble yourselves and not do any work" (Leviticus 16:29).

6. Feast of Tabernacles (Sukkot): This week-long feast celebrates the Israelites' journey through the wilderness and God's provision. It involves dwelling in temporary shelters to remember their ancestors' dependence on God. "On the fifteenth day of the seventh month, the LORD’s Feast of Tabernacles begins, and it continues for seven days" (Leviticus 23:34).

These set feasts are not only historical observances but also hold theological significance, foreshadowing the redemptive work of Christ. They are integral to understanding the rhythm of worship and the unfolding of God's plan for His people throughout biblical history.Numbers 29:39
These things you shall do to the LORD in your set feasts, beside your vows, and your freewill offerings, for your burnt offerings, and for your meat offerings, and for your drink offerings, and for your peace offerings.
Nave's Topical Index

Ezra 3:5
And afterward offered the continual burnt offering, both of the new moons, and of all the set feasts of the LORD that were consecrated, and of every one that willingly offered a freewill offering to the LORD.
Nave's Topical Index

Whether Sufficient Reason Can be Assigned for the Ceremonies ...
... aforesaid time; for three reasons assigned by Rabbi Moses. ... be observed that this
too was instituted with the ... preventing idolatry, for in the feasts of Priapus ...
/.../aquinas/summa theologica/whether sufficient reason can be.htm

Exodus
... event in connexion with which the passover was instituted. ... E this happens on the
raising of Moses' rod, xiv ... a few deal definitely with religious feasts, xxiii.14 ...
//christianbookshelf.org/mcfadyen/introduction to the old testament/exodus.htm

Article xv (viii): of Human Traditions in the Church.
... if the Gospel says that the ceremonies of Moses, which were divinely instituted,
do not ... For it is more luxurious and sumptuous than other feasts [for they ...
/.../melanchthon/the apology of the augsburg confession/part 20 article xv viii .htm

On the Sacramentals
... by Jesus Christ and the sacramentals were instituted by the ... and need not keep the
law of Moses or any ... up to Jerusalem and offer sacrifice on the great feasts. ...
/.../kinkead/baltimore catechism no 4/lesson 27 on the sacramentals.htm

The Second Helvetic Confession, AD 1566.
... defend the merits of men as to set at naught ... God employed the Patriarchs, Moses,
and the Prophets as ... But feasts instituted by men in honor of saints we reject ...
/.../ 55 the second helvetic.htm

The Third Day in Passion-Week - the Last Controversies and ...
... in the language of the Mishnah [5221] - as if instituted by Moses himself, as sitting
in Moses' seat, and ... such as the upper-most places at feasts and in ...
/.../edersheim/the life and times of jesus the messiah/chapter iv the third day.htm

The Prophecies
... called the Sanhedrin and which, having been instituted by Moses ... Christ, believed
in the books of Moses, kept them ... day; and I will turn your feasts into mourning ...
//christianbookshelf.org/pascal/pensees/section xi the prophecies.htm

The Institution of Deacons, and the History of Stephen.
... The office was instituted, because the preaching of the ... incense; and that the
institutions of Moses would retain ... earth; nor could the solemn feasts, which were ...
/.../dick/lectures on the acts of the apostles/lecture viii the institution of.htm

Whether There was any Reasonable Cause for the Ceremonial ...
... may gather that these observances were instituted by God ... that the Gentiles in
celebrating the feasts of their ... it prescribed as stated by Rabbi Moses that men ...
/.../aquinas/summa theologica/whether there was any reasonable.htm

Ten Reasons Demonstrating the Commandment of the Sabbath to be ...
... hath justly abolished all superstitious and idolatrous feasts; and only ... first day
of the week was instituted by the ... was the Sabbath-day on which Moses and the ...
/.../bayly/the practice of piety/ten reasons demonstrating the commandment.htm

What was the significance of the new moon in Bible times? | GotQuestions.org

What is the Feast of Trumpets? | GotQuestions.org

What is the Day of Atonement (Yom Kippur)? | GotQuestions.org

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