John Wesley on Isaiah 18:4

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.