Anas bin Malik reported,
The Messenger of Allah ﷺ said, "Hell will keep saying, 'Is there any more?' until the Lord of the Worlds places His Foot in it. Then its parts will recoil into one another, and it will say, 'Enough, enough, by Your might!' And there will continue to be space remaining in Paradise until Allah brings forth a new creation and settles them in the unoccupied portions of Paradise."
Azami 360
Sahihعن أنس بن مالك قال
قال رسول الله ﷺ: لا تزال جهنم تقول: هل من مزيد؟ قال: فيدلي فيها رب العالمين قدمه. قال: فينزوي بعضها إلى بعض، وتقول: قط قط بعزتك، ولا يزال في الجنة فضل حتى ينشئ الله لها خلقا آخر فيسكنه في فضول الجنة.
Imam Ahmad narrated it (12380) from Bahz and Affan, both of whom said, "Abu Aban bin Yazid Attar narrated to us, Qatada narrated to us, Anas bin Malik narrated to us," and he mentioned it.Ibn Khuzayma also narrated it in Tawhid (155) through the route of Bahz bin Assad alone with his chain of transmission, in a similar manner.