Albert Barnes Commentary Isaiah 30:23

"And he will give the rain for thy seed, wherewith thou shalt sow the ground; and bread of the increase of the ground, and it shall be fat and plenteous. In that day shall thy cattle feed in large pastures;" — Isaiah 30:23 (ASV)

Then He shall give the rain of your seed — That is, He will send rain on the seed which is sown. You will be allowed to cultivate the soil without disturbance, 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 to the notes at Isaiah 11:6-7).

And bread of the increase of the earth — And bread which the ground will produce.

And it shall be fat and plenteous — It will be rich and abundant; that is, there will be prosperity and an ample supply for your needs.

Feed in large pastures — This is a description of security when their cattle would 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 an abundance of flocks and herds.