Al-Kāfi

Hadith 1620
dua
6ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ عَبْدِ الله بْنِ الْمُغِيرَةِ عَنْ أَبِي سَعِيدٍ الْبَجَلِيِّ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيهِ السَّلام) إِنَّ الدُّعَاءَ أَنْفَذُ مِنَ السِّنَانِ.
6. Ali ibn Ibrahim has narrated from his father from ‘Abd Allah ibn al-Mughirah from abu Sa’Id al-Bajilli who has said the following: “Abu ‘Abd Allah (a.s.) has said, ‘Prayer, pleading before Allah for help is more effective than spears.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī