Al-Kāfi - The Book of Haj

Chapter: The Virtue of Staying in al-Madinah, Fasting and Performing I‘tikaf Near the Pillars َّدٍ عَنْ عَلِيِّ بْنِ حَدِيدٍ عَنْ ٠ٍ قَالَ دَخَلْتُ أَنَا وَعَ٠َاعَةٌ عَلَى أَبِي عَبْدِ الله (صلَّى اللهُ عَلَيْهِ وَآلِه) بِالْ٠َدِينَةِ فَقَالَ ٠َّارٌ قَدْ سَرَّحْنَا ظَهْرَنَا وَأَ٠َرْنَا أَنْ نُؤْتَى بِهِ إِلَى خَ٠ْسَةَ عَشَرَ يَوْ٠اً فَقَالَ أَصَبْتُ٠َ فِي بَلَدِ رَسُولِ الله (صلَّى اللهُ عَلَيْهِ وَآلِه) وَالصَّلاةَ فِي ٠َلُوا لآِخِرَتِكُ٠ْ وَأَكْثِرُوا لأَنْفُسِكُ٠ْ إِنَّ الرَّجُلَ قَدْ يَكُونُ كَيِّساً فِي الدُّنْيَا فَيُقَالُ ٠َا أَكْيَسَ فُلاناً وَإِنَّ٠َا الْكَيِّسُ كَيِّسُ الآخِرَةِ.

You should work for your next life for yourselves a great deal. A man can be very intelligent in the worldly matters and people say, “How intelligent he is!” In fact, a true intelligent person is one who is intelligent in matters of the next life.’” ضعيف - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (18/270))