Isaiah 62:9 - Matthew Poole's English Annotations on the Holy Bible

They that have gathered it, i.e. the wine mentioned in the former verse, that have brought it from their several vineyards, and laid it in their cellars, every one shall eat the fruit of his own labours; thou shalt not sow, and another reap, as formerly. And praise the Lord; they themselves shall praise him, viz. for his bounty and goodness; and others also that shall be partakers with them; God will be bountiful, and they shall be thankful. In the courts of my holiness; as I have commanded, Deuteronomy 14:23; in my courts; holiness being put for God himself by a metonymy of the adjunct; alluding to those anniversary feasts and thank-offerings that were to be eaten in those places about the temple, and perhaps in special to that part which was appropriated to the priests, implying herein that they should be all priests; and, for aught I know, here may be an allusion to the great gospel feast, or thank-offering in the Lord's supper, these promises being not only applicable to, but do point at, the soul protections and the soul provisions of the church of Christ.