Here is the institution of the feast of pentecost, or weeks, as it is called (Deu 16:9), because it was observed fifty days, or seven weeks, after the passover. It is also called the feast of harvest, Exo 23:16. For as the presenting of the sheaf of first-fruits was an introduction to the harvest, and gave them liberty to put in the sickle, so they solemnized the finishing of their corn-harvest at this feast. 1. Then they offered a handful of ears of barley, now they offered two loaves of wheaten bread, Lev 23:17. This was leavened. At the passover they ate unleavened bread, because it was in remembrance of the bread they ate when they came out of Egypt, which was unleavened; but now at pentecost it was leavened, because it was an acknowledgment of God's goodness to them in their ordinary food, which was leavened. 2. With that sheaf of first-fruits they offered only one lamb for a burnt-offering, but with these loaves of first-fruits they offered seven lambs, two rams, and one bullock, all for a burnt-offering, so giving glory to God, as the Lord of their land and the Lord of their harvest, by whose favour they lived and to whose praise they ought to live. They offered likewise a kid for a sin-offering, so taking shame to themselves as unworthy of the bread they ate, and imploring pardon for their sins, by which they had forfeited their harvest-mercies, and which they had been guilty of in the receiving of them. And lastly, two lambs for a sacrifice of peace-offerings, to beg a blessing upon the corn they had gathered in, which would be neither sure nor sweet to them without that blessing, Hag 1:9. These were the only peace-offerings that were offered on the behalf of the whole congregation, and they were reckoned most holy offerings, whereas other peace-offerings were but holy. All these offerings are here appointed, Lev 23:18-20. 3. That one day was to be kept with a holy convocation, Lev 23:21. It was one of the days on which all Israel was to meet God and one another, at the place which the Lord should choose. Some suggest that whereas seven days were to make up the feast of unleavened bread there was only one day appointed for the feast of pentecost, because this was a busy time of the year with them, and God allowed them speedily to return to their work in the country. This annual feast was instituted in remembrance of the giving of the law upon mount Sinai, the fiftieth day after they came out of Egypt. That was the feast which they were told in Egypt must be observed to God in the wilderness, as a memorial of which ever after they kept this feast. But the period and perfection of this feast was the pouring out of the Spirit upon the apostles on the day of this feast (Act 2:1), in which the law of faith was given, fifty days after Christ our passover was sacrificed for us. And on that day (as bishop Patrick well expresses it) the apostles, having themselves received the first-fruits of the Spirit, begat three thousand souls, through the word of truth, and presented them, as the first-fruits of the Christian church, to God and the Lamb.
To the institution of the feast of pentecost is annexed a repetition of that law which we had before (Lev 19:9), by which they were required to leave the gleanings of their fields, and the corn that grew on the ends of the butts, for the poor, Lev 23:22. Probably it comes in here as a thing which the priests must take occasion to remind the people of, when they brought their first-fruits, intimating to them that to obey even in this small matter was better than sacrifice, and that, unless they were obedient, their offerings should not be accepted. It also taught them that the joy of harvest should express itself in charity to the poor, who must have their due out of what we have, as well as God his. Those that are truly sensible of the mercy they receive from God will without grudging show mercy to the poor.

Ye shall count unto you - seven Sabbaths - That is, from the sixteenth of the first month to the sixth of the third month. These seven weeks, called here Sabbaths, were to be complete, i. e., the forty-nine days must be finished, and the next day, the fiftieth, is what, from the Septuagint, we call pentecost. See the note on Luk 6:1.

Then ye shall sacrifice one kid of the goats for a sin offering,.... Which was for the sin of the whole congregation, typical of Christ, whose soul was made an offering for sin; in virtue of which all other sacrifices become acceptable to God, and believers enjoy the fruits and blessings of divine grace:

and two lambs of the first year for a sacrifice of peace offerings; which Gersom says were the most holy things, and were only slain in the north, and only eaten by males, as the rest of the holy things, and are the only peace offerings of the congregation that were offered throughout the whole year.

Ye shall bring out of your habitations two wave loaves of two tenth deals, &c.--These loaves were made of "fine" or wheaten flour, the quantity contained in them being somewhat more than ten pounds in weight. As the wave-sheaf gave the signal for the commencement, the two loaves solemnized the termination of the harvest season. They were the first-fruits of that season, being offered unto the Lord by the priest in name of the whole nation. (See Exo 34:22). The loaves used at the Passover were unleavened; those presented at Pentecost were leavened--a difference which is thus accounted for, that the one was a memorial of the bread hastily prepared at their departure, while the other was a tribute of gratitude to God for their daily food, which was leavened.