'Dew' in the Bible

Mountains of Gilboa, let no dew or rain fall on you, and may none of your fields be filled with plenty, because in that place the shield of the valiant ones was defiled, the shield of Saul without an anointing with oil.

We'll go find David wherever he's hiding. We'll fall on him like dew on the ground! We'll kill him and all of his men, and we won't leave even one man alive!