Deuteronomy 16:11
9-12. Seven weeks shalt thou number—The feast of weeks, or a WEEK OF WEEKS: the feast of pentecost (see on Le 23:10; also see Ex 34:22; Ac 2:1). As on the second day of the passover a sheaf of new barley, reaped on purpose, was offered, so on the second day of pentecost a sheaf of new wheat was presented as first-fruits (Ex 23:16; Nu 28:26), a freewill, spontaneous tribute of gratitude to God for His temporal bounties. This feast was instituted in memory of the giving of the law, that spiritual food by which man's soul is nourished (De 8:3).
Deuteronomy 16:14
13-17. Thou shalt observe the feast of tabernacles seven days—(See on Ex 23:14; Le 23:34; Nu 29:12). Various conjectures have been formed to account for the appointment of this feast at the conclusion of the whole harvest. Some imagine that it was designed to remind the Israelites of the time when they had no cornfields to reap but were daily supplied with manna; others think that it suited the convenience of the people better than any other period of the year for dwelling in booths; others that it was the time of Moses' second descent from the mount; while a fourth class are of opinion that this feast was fixed to the time of the year when the Word was made flesh and dwelt—literally, "tabernacled"—among us (Joh 1:14), Christ being actually born at that season.
Esther 9:19
19. a day of . . . feasting . . . of sending portions one to another—The princes and people of the East not only invite their friends to feasts, but it is their custom to send a portion of the banquet to those who cannot well come to it, especially their relations, and those who are detained at home in a state of sorrow or distress.
Es 9:20-32. THE TWO DAYS OF PURIM MADE FESTIVAL.