Isaiah 50:9 - Coke's Commentary on the Holy Bible

Lo, they all shall wax old as a garment— The simple sense of this metaphorical expression is, that all the adversaries of Christ should be abolished and done away, like a garment, which grows vile and useless by wearing, and is at length consumed by the moths. This is expressed plainly and literally, chap. Isaiah 41:11. See also Psalms 73:27. Some think that here is an allusion to the old oeconomy, which, under the dispensation of the new, was entirely to grow old and vanish away. See Psalms 102:26-27 compared with Hebrews 1:10-12.