Isaiah 23:17,18

And it shall come to pass, after the end of seventy years, that the Lord will visit Tyre

The revival of Tyre

In the fourth and last strophe, the prophet dwells upon the revival of Tyre in the ideal future.

After seventy years of enforced retirement and quiescence, Tyre will resume her previous activity, but with the significant change, that her gains will now be consecrated to Jehovah, supplying food and stately clothing to the people of Israel who dwell in His immediate presence (Isaiah 23:18). The figure under which Isaiah expresses this thought, appears to us a strange one; but it is suggested by the reflection that devotion to gain as such, unrelieved by any ennobling principle, is an unworthy occupation, which may easily degenerate into spiritual prostitution. The prophet, having once made use of the figure, retains it to the end. Disengaged from its singular garb, the truth which he enunciates is an important one. Tyre was preeminently, in Isaiah’s day, the representative of the spirit of commerce: and the prophet here anticipates the time when this spirit may be elevated and purified. Isaiah pictures to himself the future growth of religion among the different nations with which he was acquainted under figures consonant to the peculiarities of each; in the case of Tyre, it takes the form of a purification of the base spirit of commerce; the old occupation of Tyre is not discarded, it is only purged of its worldliness, and ennobled. (Prof. S. R. Driver, D. D.)

The mercenary spirit a prostitution of the soul

In so far as commercial activity, thinking only of earthly advantage, does not recognise a God-appointed limit, and carries on a promiscuous traffic with all the world, it is a prostitution of the soul. (F. Delitzsch.)

Phoenician harlotry

Moreover, at markets and fairs, especially Phoenician ones, prostitution of the body was an old custom. (F. Delitzsch.)

Commercial harlotry

The harlot converts into a matter of traffic what should be a sacred relationship: so trade brings men together merely as buyers and sellers, not as brethren; and consequently rapidly degenerates from self-interest into selfishness, unless it be perpetually counterbalanced by other and nobler aims in the man. (Sir E. Strachey, Bart.)