Sunan al-Tirmidhi

الْكَيِّسُ مَنْ دَانَ نَفْسَهُ وَعَمِلَ لِمَا بَعْدَ الْمَوْتِ

“The wise person is one who holds himself accountable and works for what comes after death.”

— Sunan al-Tirmidhi, Tirmidhi 2459