The Messenger of Allah ﷺ said, "When the people of Paradise have entered Paradise and the people of the Fire have entered the Fire, death will be brought forth and placed between Paradise and the Fire, then it will be slaughtered. A caller will then announce, 'People of Paradise, there is no more death! People of the Fire, there is no more death!' So the people of Paradise will increase in joy upon their joy, and the people of the Fire will increase in sorrow upon their sorrow."
أن رسول الله ﷺ قال: إذا صار أهل الجنة إلى الجنة، وصار أهل النار إلى النار، أتي بالموت حتى يجعل بين الجنة والنار، ثم يذبح، ثم ينادى مناد: يا أهل الجنة! لا موت، ويا أهل النار! لا موت. فيزداد أهل الجنة فرحا إلى فرحهم، ويزداد أهل النار حزنا إلى حزنهم.
Bukhari narrated it in "The Chapter on Softening of Hearts" (6548), and Muslim in "Paradise and the Description of Its Bliss" (43:2850), both through the route of Abdullah bin Wahb, who said, Umar bin Muhammad bin Zayd bin Abdullah bin Umar bin Khattab told me that his father had told him, from Abdullah bin Umar, and he related it.