The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 520 (#Ḥadīth #1)
Chapter 21 | On the Proof of His Rightfulness Due to Ar-Ridha’s Prediction that He Will be Buried Next to Harun
1 - حدثنا أحمد بن زياد بن جعفر الهمداني قال: حدثنا علي بن إبراهيم بن هاشم عن أبيه عن موسى بن مهران قال: رأيت علي بن موسى الرضا عليهما السلام في مسجد المدينة وهارون يخطب فقال: أترونني وإياه ندفن في بيت واحد
51-1 Ahmad ibn Ziyad ibn Ja’far al-Hamadani - may God be pleased with him - narrated that Ali ibn Ibrahim ibn Hashem quoted on the authority of his father, on the authority of Musa ibn Mihran, “I saw that Ali ibn Musa Ar-Ridha’ in Medina’s mosque while Harun was delivering a sermon. Ar-Ridha’ said, ‘You will see that both him and I will be buried in one place.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).