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.

And the priests shall wave them with the bread of the firstfruits,.... The two loaves called the two wave loaves, Lev 23:17; with which were waved the two lambs of the peace offerings; and these alive, as Jarchi and Ben Gersom intimate. The Jewish doctors (z) dispute, whether, in waving, the lambs were put above the bread, or the bread above the lambs; which some reconcile by observing, that the bread was put by the side of the lambs:

for a wave offering before the Lord; being waved this way and that way, upwards and downwards, and towards the several quarters of the world, showing that the fruits of the earth were owing to the providential goodness of God everywhere:

with the two lambs; not that all the above sacrifices were waved, or any part of them, along with the lambs, but the wave loaves, and they were waved together, as one wave offering to the Lord:

they shall be holy to the Lord for the priests; both the loaves and the lambs, these were separated and devoted wholly to the Lord, and to be eaten by his priests; the peace offerings of a single person were light holy things, as Jarchi says; but the peace offerings of the congregation, as these were, are the most holy things, and so to be eaten only by the priests, and by the males only, in the court of the tabernacle.

(z) In Torat Cohenim, apud Yalkut in loc.

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.