Leviticus 23:2

“Speak unto the children of Israel, and say unto them, etc.] Speak to them to gather together, and then say unto them what follows, they all being obliged to keep the feasts, and observe the solemnities hereafter directed to; though it may be the heads of the tribes and the elders of the people were summoned together, and the following things were delivered to them, and by them to the people: [concerning] the feasts of the Lord, which ye shall proclaim [to be] holy convocations, [even] these [are] my feasts; appointed and ordered by God, and to be kept to the honour of his name; these are the general names for the particular holy times and seasons after appointed; they are in general called…”

“The feasts - literally, the appointed times. So in Leviticus 23:4, Leviticus 23:37, etc. This section Leviticus 23:1-38 sets forth for practical guidance the relation in which the appointed times of the Lord, weekly as well as annual, stood to the ordinary occupations of the people. Holy convocations - Days of sabbatical rest for the whole people; they owed their name to gatherings for religious edification, which, in later times, were probably held in every town and village in the holy land. There were in the course of the year, besides the weekly Sabbaths, seven days of holy convocation Exodus 12:16; Numbers 28:18, Numbers 28:25-26; Numbers 29:1, Numbers 29:12, Numbers 29:35, with a…”

“Ye shall proclaim - Cause to be proclaimed, by the priests. Holy convocations - Days for your assembling together to my worship in a special manner. Leviticus 23:3”

“23:2 These appointed festivals included occasions for eating, resting, and even fasting. For additional details, see Num 28–29.”

“the feasts: God appointed several festivals among the Jews. The Passover was celebrated on the 14th, or rather 15th day of the first month in the ecclesiastical year, which was the seventh of the civil year, and lasted seven days. The Pentecost was celebrated on the fiftieth day after the passover, in memory of the law's being given to Moses on Mount Sinai, fifty days, or seven weeks after the departure out of Egypt. The word is derived from the Greek word Πεντηκοστη, which signifies the fiftieth. The Hebrews call it the feast of weeks, Exo 34:22. The feast of trumpets, celebrated on the first day of the civil year, when a trumpet was sounded, to proclaim its commencement, which was in the…”