Isaiah 23:18 - Matthew Poole's English Annotations on the Holy Bible

Her merchandise and her hire shall be holiness to the Lord: he speaks not here of what the Tyrians would do immediately after their restitution, but some time after it, even in the days of the Messiah; of which even some of the Jewish rabbies understand it, and to which the prophets have a special respect in their several prophecies, and Isaiah among and above the rest of them. So this is a prophecy concerning the conversion of the Tyrians to the true religion, of the accomplishment whereof something is said Acts 21:3-5, and more in other authors. It shall not be treasured nor laid up, either out of covetousness, or for the service of their pride and luxury, as they formerly did; but now they shall freely lay it out upon pious and charitable uses. For them that dwell before the Lord; for the support and encouragement of the ministers of holy things, who shall teach the good knowledge of the Lord, who dwell in God's house, and minister in his presence; the support of such persons being not only an act of justice and charity, but also of piety, and of great use and necessity to maintain and propagate religion in the world. Although this doth not exclude, but rather imply, their liberality in contributing to the necessities of all Christians.