This in the summer is so copious in Palestine that it supplies to some extent the absence of rain and becomes important to the agriculturist. Thus it is coupled in the divine blessing with rain, or mentioned as a prime source of fertility, (Genesis 27:28; 33:13; Zechariah 8:12) and its withdrawal is attributed to a curse. (2 Samuel 1:21; 1 Kings 17:1; Haggai 1:10) It becomes a leading object in prophetic imagery by reason of its penetrating moisture without the apparent effort of rain, ( 32:2; Job 29:19; Psalms 133:3; Hosea 14:5) while its speedy evanescence typifies the transient goodness of the hypocrite. (Hosea 6:4; 13:3)
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Smith, William, Dr. "Entry for 'Dew'". "Smith's Bible Dictionary".