Al-Kāfi - Volume 5 > The Meaning of Zuhd (Asceticism)
Hadith #1

1- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ النَّوْفَلِيِّ عَنِ السَّكُونِيِّ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ قُلْتُ لَهُ مَا الزُّهْدُ فِي الدُّنْيَا قَالَ وَيْحَكَ حَرَامَهَا فَتَنَكَّبْهُ.

1. Ali ibn Ibrahim has narrated from his father from af-Nawfafiy from af-Sakuniy who has said the following: “This is concerning my question before abu ‘ Abd Allah, ‘Alayhi al-Salam, about the meaning of restraint from worldly matters. He (the Imam) said, Tie upon you! It is (not difficult to understand) knowing what is unlawful so that you can avoid it.’”