Rest — I will not bestir myself, to help this people. God is said in scripture to rest, or sit still, when he doth not work on the behalf of a person or people. Dwelling — place — In heaven, the place where God dwells. Harvest — The sense is, that God would look upon them with as uncomfortable an influence as the sun with a clear heat upon the herbs, which are scorched and killed by it; and as a cloud of the dew, which brings dew or rain, in the heat of harvest, when it is unwelcome and hurtful.
Related Commentaries of Isaiah 18:4
Isaiah 18:4
4 For so the LORD said unto me, I will take my rest, and I will considerb in my dwelling place like a clear heat upon herbs, and like a cloud of dew in the heat of harvest.