لَهُمْ فِيْهَا مَا يَشَاۤءُوْنَ خٰلِدِيْنَۗ كَانَ عَلٰى رَبِّكَ وَعْدًا مَّسْـُٔوْلًا ( الفرقان: ١٦ )
Lahum feehaa maa yashaaa'oona khaalideen; kaana 'alaa Rabbika wa'dam mas'oolaa (al-Furq̈ān 25:16)
For them therein is whatever they wish, [while] abiding eternally. It is ever upon your Lord a promise [worthy to be] requested. (Al-Furqan  : 16)
1 Mufti Taqi Usmani
For them there will be whatever they wish, while they will be eternal. This is a promise undertaken by your Lord, (the fulfillment of) which is worth praying for.