Test me in this," says the LORD Almighty, "and see if I will not throw open the floodgates of heaven and pour out so much blessing that you will not have room enough for it. I will prevent pests from devouring your crops, and the vines in your fields will not cast their fruit," says the LORD Almighty.

What does it mean to open the floodgates?

: to remove something serving to restrain an outburst Many people fear that the court's latest ruling will open the floodgates for/to a host of new lawsuits.

Is open the floodgates an idiom?

Idiom: 'Open the floodgates'