The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 507 (#Ḥadīth #38)
Chapter 17 | On Indications of the Divine Leadership of Ar-Ridha
38 - حَدَّثَنا أَحْمَدِ بْنِ مُحَمَّدِ بْنِ يَحْيَى العَطَّار قالَحَدَّثَني أَبي عَنْ مُحَمَّدِ بْنِ عِيسَى عَنْمهران أَنَّهُ كَتَبَ إِلَى الرِّضَا a.sُ يَسْأَلُهُ أَنْ يَدْعُوَاللَّهَ لابْنٍ لَهُ فَكَتَبَ a.sُ إِلَيْهِ وَهَبَ اللَّهُ لَكَ ذَكَراً صَالِحاً فَمَاتَ ابْنُهُ ذَلِكَ وَوُلِدَ لَهُ ابْنٌ.
47-38 Ahmad ibn Muhammad ibn Yahya al-Attar - may God be pleased with him - narrated that his father quoted on the authority of Muhammad ibn Isa, on the authority of Musa ibn Mehran, “I wrote to Ar-Ridha’ and asked him to pray for my (ill) son. The Imam wrote me back, ‘God will grant you a good son.’ My son died and I was given another son.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).