Isaiah 24:18 (b) GOD uses this figure to describe the pouring out of the wrath of GOD from Heaven as though one were shooting arrows or throwing stones from the apertures of a fort.
Malachi 3:10 (b) This type probably is based on the fact that the windows, or upper doors of the buildings, were often open to throw out feed for the animals. I have a photograph of a flock of sheep in a barnyard looking up at a closed window in a large barn, from which presently the farmer will throw out their feed. In like manner, GOD, in a spiritual way, opens up the windows of Heaven to pour out great blessings and good things for His people. He expects us to be waiting under those windows, with large baskets, to receive the rich things which He will throw out. This is the truth represented in the above Scripture.