It shall come to pass in that day. — The prophet now passes on to the purification of the Church from the defilements mentioned by Isaiah (Isaiah 2:3-10), with reference to the ultimate holiness which shall be established “in that day.”
I will cut off thy horses. — The possession of horses was imperatively forbidden to the Jewish king (Deuteronomy 17:16), and Isaiah describes the land as at this time “full of horses, neither is there any end of their chariots.” As symbolising the power of man, these horses shall be cut off, and the reliance of the Church shall be on God alone. “Some trust in chariots, and some in horses, but we will remember the name of the Lord our God” (Psalms 20:7).