لَهُمْ فِيهَا مَا يَشَاؤُونَ خَالِدِينَ كَانَ عَلَى رَبِّكَ وَعْدًا مَسْؤُولًا
[25:16]
They shall have therein what they desire abiding (in it); it is a promise which it is proper to be prayed for from your Lord.
"For them there will be therein all that they wish for: they will dwell (there) for aye: A promise to be prayed for from thy Lord."
Therein abiding, they have all that they desire. It is for thy Lord a promise that must be fulfilled.