﴿ وَمَا جَعَلْنَا لِبَشَرٍۢ مِّن قَبْلِكَ ٱلْخُلْدَ ۖ أَفَإِي۟ن مِّتَّ فَهُمُ ٱلْخَٰلِدُونَ ﴾

“AND [remind those who deny thee, O Prophet, that] never have We granted life everlasting to any mortal before thee: but do they, perchance, hope that al­though thou must die, they will live forever?””

Please check ayah 21:35 for complete tafsir.