Commentaries:
Jamieson, Fausset, and Brown
Zidon—called on, as being the parent country of Tyre (Isaiah 23:12), and here equivalent to Phœnicia in general, to feel the shame (as it was esteemed in the East) of being now as childless as if she never had any. "I (no more now) travail, nor bring forth," etc. "Strength of the sea," that is, stronghold, namely, New Tyre, on a rock (as "Tyre" means) surrounded by the sea (Ezekiel 26:4, Ezekiel 26:14-17; so Venice was called "Bride of the sea"; Zechariah 9:3).
Other Jamieson, Fausset, and Brown entries containing Isaiah 23:4:
Isaiah 47:8
Jeremiah 14:17
Ezekiel 26:10
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