The Messenger of Allah ﷺ said, "Hellfire will keep saying, 'Are there any more?' [Qaf 50:30] until the Lord of the Worlds places His foot upon it, causing its parts to draw together, and it will say, 'By Your might, enough, enough!' And Paradise will continue to have empty space until Allah brings forth another creation and settles them in the remaining parts of Paradise."
حدثنا عبد الصمد حدثنا أبان حدثنا قتادة
أن رسول الله ﷺ قال لا تزال جهنم تقول {هل من مزيد} فيقول رب العالمين فيضع قدمه فيها فينزوي بعضها إلى بعض وتقول بعزتك قط قط ولا يزال في الجنة فضلا حتى ينشئ الله خلقا آخر فيسكنه في فضول الجنة
Its isnad is sahih. Abdul-Samad is Ibn Abdul-Warith, a well-known trustworthy narrator, and Aban is Ibn Yazid Attar, also a well-known trustworthy narrator, and likewise Qatada. The hadith has already appeared at 12321 in a fuller form than this.