John Gill Commentary Isaiah 65:21

"And they shall build houses, and inhabit them; and they shall plant vineyards, and eat the fruit of them." — Isaiah 65:21 (ASV)

And they shall build houses, and inhabit them In Jerusalem, and other parts of Judea: though this need not be limited to the Jews, but be considered as reaching to all the Lord's people, the Gentiles also; who will be in no fear of enemies, or ever be disturbed by them, but shall dwell in their own houses peaceably and quietly; this is the reverse of what is threatened to the wicked, (Deuteronomy 28:30).

and they shall plant vineyards , and eat the fruit of them; they shall both live to dwell in their houses when built, and till their vineyards bring forth fruit, and then eat of them; and they shall be preserved from enemies breaking in upon them, and wasting their plantations.