The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 565 (#Ḥadīth #12)

12- حَدَّثَنا أبي رَضِىَ اللهُ عَنْهُ قالَ حَدَّثَنا سعد بن عَبدُاللَّه عَن أَحمَد بن مُحَمَّد بن عيسى عَن عَبد الرحمن بن أبي نجران قالَ سألت أبا جَعفَر a.sُ ما تَقُولُ لِمَن زَارَ أَبَاكَ قَالَ الجَنَّةَ وَاللَّه

66-12 (The author of the book narrated) my father - may God be pleased with him - narrated that Sa’d ibn Abdullah quoted on the authority of Ahmad ibn Muhammad ibn Isa, on the authority of Abdul Rahman ibn Abi Najran that he asked Aba Ja’far , “Do you know what the reward is for someone who visits your father?” Aba Ja’far replied, “By God! It is Heaven.”

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