Al-Furqaan 16

لَّهُمْ فِيهَا مَا يَشَآءُونَ خَٰلِدِينَ كَانَ عَلَىٰ رَبِّكَ وَعْدًا مَّسْـُٔولًا ﴿١٦﴾

Lahum feeha ma yashaoona khalideena kana AAala rabbika waAAdan masoolan

For them there will be therein all that they desire, and they will abide (there forever). It is a promise binding upon your Lord that must be fulfilled. The Noble Quran