John Wesley on Isaiah 23:18

Holiness - This is a prophecy concerning the conversion of the Tyrians to the true religion. Laid up - Either out of covetousness, or for their pride and luxury, as they formerly did; but now they shall freely lay it out upon pious and charitable uses. Shall be - For the support and encouragement of the ministers of holy things, who shall teach the good knowledge of the Lord. Although this does not exclude, but rather imply their liberality in contributing to the necessities of all Christians.