Jamieson, Fausset and Brown on Isaiah 23:9

9. Whoever be the instruments in overthrowing haughty sinners, God, who has all hosts at His command, is the First Cause (Is 10:5-7).

stain--rather, "to profane"; as in Ex 31:14, the Sabbath, and other objects of religious reverence; so here, "the pride of all glory" may refer to the Tyrian temple of Hercules, the oldest in the world, according to Arrian (Is 2:16); the prophet of the true God would naturally single out for notice the idol of Tyre [G. V. Smith]. It may, however, be a general proposition; the destruction of Tyre will exhibit to all how God mars the luster of whatever is haughty (Is 2:11).