'Dew of Heaven' in the Bible

Nevertheless leave the stump of its roots in the earth, even with a band of iron and bronze, in the tender grass of the field; and let it be wet with the dew of heaven, and let his portion be with the beasts in the grass of the earth:

And since the king saw a watcher and a holy one coming down from heaven, and saying, Hew the tree down, and destroy it; yet leave the stump of its roots in the earth, even with a band of iron and bronze, in the tender grass of the field; and let it be wet with the dew of heaven, and let his portion be with the beasts of the field, till seven times pass over him;

That they shall drive you from men, and your dwelling shall be with the beasts of the field, and they shall make you eat grass like oxen, and they shall wet you with the dew of heaven, and seven times shall pass over you, till you know that the most High rules in the kingdom of men, and gives it to whomever he will.

The same hour was the thing fulfilled upon Nebuchadnezzar: and he was driven from men, and did eat grass like oxen, and his body was wet with the dew of heaven, till his hair had grown like eagles' feathers, and his nails like birds' claws.

And he was driven from the sons of men; and his heart was made like the beasts, and his dwelling was with the wild donkeys: they fed him with grass like oxen, and his body was wet with the dew of heaven; till he knew that the most high God ruled in the kingdom of men, and that he appoints over it whomever he will.