What the Bible says about Dew of Heaven
(From Forerunner Commentary)
"Dew of heaven" indicates rain in due season in the right amount. "Fatness of the earth" indicates rich soil, as well as mineral wealth.
John W. Ritenbaugh
Where Is the Beast? (Part Three)
What is this dew that is to be withheld? This is similar to what we see in Isaiah 5:6, where God says, "I will command the clouds that they rain no rain upon it." Could the dew and rain refer to God's Spirit? Do we see His Spirit being poured out as it once was in the church? Certainly, God would withhold His Spirit from a church that has largely apostatized.
Ronny H. Graham
The Dew of Heaven