Al-Kāfi

Hadith 1432
certainty
7ـ عَنْهُ عَنْ أَبِيهِ رَفَعَهُ إِلَى أَبِي جَعْفَرٍ (عَلَيهِ السَّلام) قَالَ لا يَنْفَعُ مَعَ الشَّكِّ وَالْجُحُودِ عَمَلٌ.
7. It is narrated from him (narrator of the Hadith above) from his father in a marfu’ manner from abu la’ far (a.s.) who has said the following: “Abu Ja’far (a.s.) has said, ‘No deed with doubt and denial will be of any benefit.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī