Nahj al-Balāgha

Hadith 129
asceticismimam-aliahl-al-bayt
امَّا بَعْدُ، فَإِنَّ الدُّنْيَا قَدْ أَدْبَرَتْ، وَآذَنَتْ بِوَدَاعٍ، وَإِنَّ الاْخِرَةَ قَدْ أَقْبَلَتْ، وَأَشْرَفَتْ بِاطِّلاَعٍ
So now, surely this world has turned its back and announced its departure while the next world has appeared forward and proclaimed its approach.
Source: al-Sharīf al-Raḍī