Al-Kāfi

Hadith 1306
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5ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ حَمَّادٍ عَنْ حَرِيزٍ عَنْ زُرَارَةَ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلام) قَالَ الدُّعَاءُ بَعْدَ الْفَرِيضَةِ أَفْضَلُ مِنَ الصَّلاَةِ تَنَفُّلاً.
5. Ali ibn Ibrahim has narrated from his father from Hammad from Hariz from Zurarah who has said the following: “Abu Ja’far (a.s.), has said, ‘Prayer after an obligatory Salah (prayer) is better than after non-obligatory Salah (prayer).”’
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī