4. These are the feasts of the Lord, which ye shall proclaim in their seasons--Their observance took place in the parts of the year corresponding to our March, May, and September. Divine wisdom was manifested in fixing them at those periods; in winter, when the days were short and the roads broken up, a long journey was impracticable; while in summer the harvest and vintage gave busy employment in the fields. Besides, another reason for the choice of those seasons probably was to counteract the influence of Egyptian associations and habits. And God appointed more sacred festivals for the Israelites in the month of September than the people of Egypt had in honor of their idols. These institutions, however, were for the most part prospective, the observance being not binding on the Israelites during their wanderings in the wilderness, while the regular celebration was not to commence till their settlement in Canaan.

JFB.