Isaiah 23:15

“And it shall come to pass in that day, &c.] 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 harlot cast off and forgotten by her lover: the term of time is the same with that of the captivity of the Jews in Babylon, and great part of it at least run out along with it; for Tyre was destroyed by Nebuchadnezzar, as Jerusalem was, though some time after it, and was restored when the Babylonish empire was destroyed, at the expiration of…”

“forgotten--Having lost its former renown, Tyre shall be in obscurity. seventy years--(so Jer 25:11-12; Jer 29:10). days of one king--that is, a dynasty. The Babylonian monarchy lasted properly but seventy years. From the first year of Nebuchadnezzar to the taking of Babylon, by Cyrus, was seventy years; then the subjected nations would be restored to liberty. Tyre was taken in the middle of that period, but it is classed in common with the rest, some conquered sooner and others later, all, however, alike to be delivered at the end of the period. So "king" is used for dynasty (Dan 7:17; Dan 8:20): Nebuchadnezzar, his son Evil-merodach, and his grandson, Belshazzar, formed the whole dynasty…”

“Tyre shall be forgotten - Shall cease to be a place of importance in commerce; shall be unheard of in those distant places to which ships formerly sailed. Seventy years, according to the days of one king - ‘That is, of one kingdom (see Daniel 7:17; Daniel 8:20).’ (Lowth) The word ‘king’ may denote dynasty, or kingdom. The duration of the Babylonian monarchy was properly but seventy years. Nebuchadnezzar began his conquest in the first year of his reign, and from thence to the taking of Babylon by Cyrus was seventy years. And at that time the nations that had been conquered and subdued by the Babylonians would be restored to liberty. Tyre was, indeed, taken toward the middle of that period,…”

“Forgotten - Neglected and forsaken. Seventy years - During the time of the Jewish captivity in Babylon. Tyre was taken by Nebuchadnezzar, Jer 27:3, Jer 27:8; Eze 26:7, a little after the taking of Jerusalem and was restored by the favour of the Persian monarchs after the return of the Jews. One king - One royal race of Nebuchadnezzar, including his son, and his son's son, in whom his family and kingdom were to expire. Sing - She shall by degrees return to her former traffick, whereby she shall easily entice the merchants of the world to trade with her, as harlots use to entice men by lascivious songs. Isaiah 23:16”

“23:15-18 There was hope for Tyre.”

“Tyre shall: Jer 25:9-11, Jer 25:22, Jer 27:3-7, Jer 29:10; Eze 29:11 one king: Dan 7:14, Dan 8:21; Rev 17:10 shall Tyre sing as an harlot: Heb. it shall be unto Tyre as the song of an harlot, Eze 27:25; Hos 2:15 Isaiah 23:16”

“The prophet here foretells the rise of Tyre again at the close of the Chaldean world-wide monarchy. "And it will come to pass in that day, that Tzor will be forgotten seventy years, equal to the days of one king; after the end of the seventy years, Tzor will go, according to the song of the harlot. Take the guitar, sweep through the city, O forgotten harlot! Play bravely, sing zealously, that thou mayest be remembered!" The "days of a king" are a fixed and unchangeable period, for which everything is determined by the one sovereign will (as is the case more especially in the East), and is therefore stereotyped. The seventy years are compared to the days of such a king. Seventy is well fitted…”