Then shall he give the rain of thy seed - That is, he shall send rain on the seed which is sown. You will be allowed to cultivate the soil without molestation, and God will give you fruitful seasons and abundant harvests. This is a poetic description of a happy or golden age, when there would be peace and prosperity (compare the notes at Isaiah 11:6-7).
And bread of the increase of the earth - And bread which the ground shall produce.
And it shall be fat and plenteous - It shall be rich and abundant; that is, there shall be prosperity and an ample supply for your needs.
Feed in large pastures - This is a description of security when their cattle should be permitted to roam at large, and have abundant pasturage - an image of prosperity that would be very gratifying to a people whose main conception of wealth consisted in abundance of flocks and herds.