The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 95 (#Ḥadīth #95)

95 - وَبِهذَا الإِسنادِ قالَ: قالَ رَسُولُ اللَّهِ صَلَّى اللهُعَلَيْهِ وَآلِهِ: الدُّعاءُ سِلاحُ المُؤمِنِ، وَعِمادُ الدِّينِ، وَنُورُ السَّمواتِ وَالأَرْضِ[فَعَلَيكُم بِالدُّعاءِ وَاخلِصُوا النِّيَّةَ] .

31-95 According to the same documentation, God’s Prophet (S) said, “Supplication is the weapon of a believer. It is the pillar of the religion, light from the heavens and the Earth. (Thus I advise you to say supplications and purify your intentions.)”

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).