Hadith on Akhirah: No death in Hereafter, only eternity

Abdullah ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, said, “When the people of Paradise will be sent to Paradise, and the people of Hellfire will be sent to Hellfire, until they are separated between them. Then, death will be slaughtered and a heavenly caller will announce: O people of Paradise, there is no death! O people of Hellfire, there is no death! For the people of Paradise, it will add joy to their joy, and for the people of Hellfire, it will add grief to their grief.

Source: Ṣaḥīḥ Muslim 2850

Grade: Sahih (authentic) according to Muslim

عَنْ عَبْدِ اللهِ بْنِ عُمَرَ أَنَّ رَسُولَ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ إِذَا صَارَ أَهْلُ الْجَنَّةِ إِلَى الْجَنَّةِ وَصَارَ أَهْلُ النَّارِ إِلَى النَّارِ أُتِيَ بِالْمَوْتِ حَتَّى يُجْعَلَ بَيْنَ الْجَنَّةِ وَالنَّارِ ثُمَّ يُذْبَحُ يعني الموت ثُمَّ يُنَادِي مُنَادٍ يَا أَهْلَ الْجَنَّةِ لَا مَوْتَ وَيَا أَهْلَ النَّارِ لَا مَوْتَ فَيَزْدَادُ أَهْلُ الْجَنَّةِ فَرَحًا إِلَى فَرَحِهِمْ وَيَزْدَادُ أَهْلُ النَّارِ حُزْنًا إِلَى حُزْنِهِمْ

2850 صحيح مسلم كتاب الجنة وصفة نعيمها وأهلها باب النار يدخلها الجبارون والجنة يدخلها الضعفاء