Al-Kāfi
Hadith 1203ـ ابْنُ مَحْبُوبٍ عَنْ هِشَامِ بْنِ سَالِمٍ قَالَ سَمِعْتُ أَبَا عَبْدِ الله (عَلَيهِ السَّلام) يَقُولُ إِنَّ الْعَمَلَ الدَّائِمَ الْقَلِيلَ عَلَى الْيَقِينِ أَفْضَلُ عِنْدَ الله مِنَ الْعَمَلِ الْكَثِيرِ عَلَى غَيْرِ يَقِينٍ.
3. Ibn Mahbub has narrated from Hisham ibn Salim who has said the following: “I heard Abu ‘Abdillah (a.s.) saying, ‘The little but continuous deed with certainty is far better in the sight of Allah than a great deal of deeds without certainty.’”