Zechariah 9:3

Tyrus; which was naturally a strong hold, situate on a great rock in the sea. Did build herself a strong hold; fortified herself mightily, and then thought herself impregnable. Heaped up silver; gathered treasure, and laid it up, so that there was no end of it. As the dust: it is a proverbial speech, and speaks the very rich stores of their gold and silver, by which they might buy their peace, or maintain their war. So that here is wisdom, strength, and treasure, the master sinews of war, yet all these cannot profit them in the day of their calamities approaching.