That I will give you the rain of your land in his due season, {e} the first rain and the latter rain, that thou mayest gather in thy corn, and thy wine, and thine oil.

(e) In the seed time, and toward harvest.

Wesley's Notes

11:14 The ruin of your land - Which is, proper to your land, not common to Egypt, where, as all authors agree, there is little rain. The first rain fell in seed time, to make the corn spring, the other a little before harvest, to ripen it.

Jamieson-Fausset-Brown Bible Commentary

14. the first rain and the latter rain-The early rain commenced in autumn, that is, chiefly during the months of September and October, while the latter rain fell in the spring of the year, that is, during the months of March and April. It is true that occasional showers fell all the winter; but, at the autumnal and vernal seasons, they were more frequent, copious, and important; for the early rain was necessary, after a hot and protracted summer, to prepare the soil for receiving the seed; and the latter rain, which shortly preceded the harvest, was of the greatest use in invigorating the languishing powers of vegetation (Jer 5:24; Joe 2:23; Am 4:7; Jas 5:7).

Matthew Henry's Concise Commentary

11:8-17 Moses sets before them, for the future, life and death, the blessing and the curse, according as they did or did not keep God's commandment. Sin tends to shorten the days of all men, and to shorten the days of a people's prosperity. God will bless them with an abundance of all good things, if they would love him and serve him. Godliness has the promise of the life that now is; but the favour of God shall put gladness into the heart, more than the increase of corn, and wine, and oil. Revolt from God to idols would certainly be their ruin. Take heed that your hearts be not deceived. All who forsake God to set their affection upon any creature, will find themselves wretchedly deceived, to their own destruction; and this will make it worse, that it was for want of taking heed.