You shall observe the Feast of Weeks, the firstfruits of wheat harvest, and the Feast of Ingathering at the year’s end.
Here is a repetition of several appointments made before, especially relating to their solemn feasts. When they had made the calf, they proclaimed a feast in honour of it; now, that they might never do so again, they are here charged with the observance of the feasts which God had instituted.
Commenting on Exodus 34:18-27
For I will cast out the nations before thee,.... Who are particularly mentioned, Exo 34:11 and therefore they need not be in any fear of them, when they should go up to the appointed place, and appear before the Lord; for to this they were not obliged, until they were come into the land of Canaan, and the inhabitants driven out before them: and enlarge...
And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year's end. (g) Which was in September, when the days got shorter, that is, the end of their calendar year.