Al-Kāfi

Hadith 452
trials-afflictions
4ـ عَلِيٌّ عَنْ أَبِيهِ عَنْ عَبْدِ الله بْنِ الْمُغِيرَةِ عَنْ أَبِي الصَّبَّاحِ قَالَ قَالَ أَبُو جَعْفَرٍ (عَلَيْهِ الْسَّلام) سَهَرُ لَيْلَةٍ مِنْ مَرَضٍ أَفْضَلُ مِنْ عِبَادَةِ سَنَةٍ.
4. Ali has narrated from his father from ‘Abdillah Ibn al-Mughira from Abi al-Sabbah that Abu Ja‘far (al-Jawad) (as) said: "Passing a sleepless night due to an illness is more rewarding than a whole year worshipping."
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī