Three times a year you are to celebrate a feast to Me.
Exodus 23:14. Three times shalt thou keep a feast. It is strange that Moses, who elsewhere enumerates several feast-days, should here only command them to appear in God’s presence thrice a year. Where then is the feast of trumpets and the day of atonement? for undoubtedly all were to be celebrated at Jerusalem.
God commanded the land to rest every seventh year to show Israel both His abundance and their dependence on Him alone. This was no mercy to the soil but a test of their obedience in the very matter that touches their purse, whether they would trust His Providence as surely as the sixth day's manna served for two days' meat.
AI summary
Commenting on Exodus 23:10-19
And the feast of harvest,.... This is the second feast, the feast of wheat harvest, between which and barley harvest were fifty days; or between the firstfruits of the one and the first fruits of the other were seven weeks, as Aben Ezra observes, and was sometimes called the feast of weeks; at which feast were to be brought: the first fruits of thy labours...