Genesis 9:13 - Matthew Poole's English Annotations on the Holy Bible

I do set my bow; Heb. I have given, i.e. I will from time to time give and place. God calleth it his bow, partly because it was his workmanship, and chiefly because it was his pledge, and the seal of his promise. In the cloud, a proper seat for it; that they might now fetch an argument of faith from thence, whence before they had matter of just fear; and that which naturally was and is a sign of rain, might by this new appointment of God be turned into an assurance that there should be no such overflowing rain as now had been.