Al-Kāfi

Hadith 1784
duaoppression
3ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ النَّوْفَلِيِّ عَنِ السَّكُونِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وآلِه) إِيَّاكُمْ وَدَعْوَةَ الْمَظْلُومِ فَإِنَّهَا تُرْفَعُ فَوْقَ السَّحَابِ حَتَّى يَنْظُرَ الله عَزَّ وَجَلَّ إِلَيْهَا فَيَقُولَ ارْفَعُوهَا حَتَّى أَسْتَجِيبَ لَهُ وَإِيَّاكُمْ وَدَعْوَةَ الْوَالِدِ فَإِنَّهَا أَحَدُّ مِنَ السَّيْفِ.
3. Ali ibn Ibrahim has narrated from his father from al-Nawfali from al-Sakuni from Abu ‘Abdillah (a.s.) who has said the following: “The Messenger of Allah has said, ‘Beware of the prayer of an oppressed; it climbs over the cloud and Allah, the Most Majestic, the Most Holy, looks at it and says, “Raise it up so it is accepted,” and beware of the prayer of a father; it is sharper than a sword.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī