"He thinks that his wealth will make him immortal," meaning: he thinks that it will make him dwell in it throughout his life.
﴿يحْسب أَن مَاله أخلده﴾ أَيْ: يَحْسَبُ أَنَّهُ يُخَلِّدُ فِيهِ حَيَاته
