In that day Tyre will be forgotten for seventy years, like the days of one king. At the end of seventy years, it will happen to Tyre as in the song of the prostitute:
15. And it shall come to pass in that day. After having spoken of the taking of Tyre, he next declares how long her calamity shall endure. It happens that cities which have been ruined are suddenly restored, and regain their former position; but the Prophet testifies that this city will be desolate and ruinous for seventy years.
Here is, I. The time fixed for the continuance of the desolations of Tyre, which were not to be perpetual desolations: Tyre shall be forgotten seventy years, Isa 23:15. So long it shall lie neglected and buried in obscurity. It was destroyed by Nebuchadnezzar much about the time that Jerusalem was, and lay as long as it did in its ruins. See the folly of that proud ambitious conqueror.
Commenting on Isaiah 23:15-18
And it shall come to pass in that day,.... When Tyre is destroyed, from that time forward: that Tyre shall be forgotten seventy years; shall so long lie in its ruin, and not be rebuilt; it shall be without inhabitants, and unfrequented by men; there shall be no merchandise in it during that time; no merchants will come nigh it; she will be like a...