Albert Barnes Commentary Isaiah 65:13

"Therefore thus saith the Lord Jehovah, Behold, my servants shall eat, but ye shall be hungry; behold, my servants shall drink, but ye shall be thirsty; behold, my servants shall rejoice, but ye shall be put to shame;" — Isaiah 65:13 (ASV)

Therefore, thus says the Lord God – The design of this verse is to show what the difference would be between those who kept and those who forsook His commandments. The one would be objects of His favor and have abundance; the other would be objects of His displeasure and be subjected to the evils of poverty, grief, and want.

My servants shall eat – They shall have abundance. They shall be objects of My favor.

But you – You who revolt from Me and who worship idols.

shall be hungry – You shall be subjected to the evils of want. The idea is that the one should partake of His favor; the other should be punished.