Hud 11:107

Khalideena feeha ma damatiassamawatu wal-ardu illama shaa rabbuka inna rabbaka faAAAAalun limayureed

[They will be] abiding therein as long as the heavens and the earth endure, except what your Lord should will. Indeed, your Lord is an effecter of what He intends.

They shall remain there forever, as long as the heavens and the earth remain intact, unless your Lord wills (otherwise). Surely, your Lord does what He intends.