Ask ye of the LORD rain in the time of the latter rain; so the LORD shall make bright clouds, and give them showers of rain, to every one grass in the field. Ask ye of the Lord rain - Rain in the due seasons -
1. To impregnate the seed when sown; and
2. To fill the ear near the time of harvest - was so essential to the fertility of the land, and the well-being of the people, that it stands well among the chief of God's mercies and the promise of it here shows that God designs to ensure the prosperity promised, by using those means by which it was promoted.