John Gill Commentary Zechariah 9:3

"And Tyre did build herself a stronghold, and heaped up silver as the dust, and fine gold as the mire of the streets." — Zechariah 9:3 (ASV)

And Tyrus did build herself a strong hold
Tyre was built upon a rock, and was a strong fortress itself, from which it had its name; and, besides its natural defence, it had a wall one hundred and fifty feet high, and its breadth was answerable to its height ^F5 ; but yet, as it could not defend itself against Alexander the great, who took it; so neither against the Gospel of Christ, which found its way into it, and was mighty to pull down strong holds in a spiritual sense:

and heaped up silver as the dust, and fine gold as the mire of the
streets ;
the riches of these cities, especially Tyre, are often made mention of; they were famous for their wealth, being places of great trade and merchandise; see (Isaiah 23:2Isaiah 23:8) (Ezekiel 27:3) (Ezekiel 28:4Ezekiel 28:5) all which were to be holiness to the Lord, and for the sufficient feeding and durable clothing of them that dwell before him, (Isaiah 23:18) his ministers.

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FOOTNOTES:

• F5: Arrian. de Exped. Alex. l. 2. c. 21.