Hadith 521
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51-2 Muhammad ibn Ali Majilawayh - may God be pleased with him - narrated that his uncle Muhammad ibn Abil Qasim quoted on the authority of Muhammad ibn Ali al-Qurashi, on the authority of Muhammad ibn al-Fodhayl
“I heard someone narrate that he had heard Ar-Ridha’ (a.s.) say the following while he was looking at Harun in Mina or Arafat, ‘He and I will be buried this way’ while he held two of his fingers side by side. We could not understand what Ar-Ridha’ (a.s.) meant until his life ended in Toos as it did. Then Al-Ma’mun ordered to bury Ar-Ridha’ (a.s.) next to Harun Ar-Rashid.
2 - حدثنا محمد بن علي ماجيلويه رضي الله عنه عن عمه محمد بن أبي القاسم قال: حدثني محمد بن علي القرشي عن محمد بن الفضيل قال
أخبرني من سمع الرضا عليه السلام وهو ينظر إلى هارون بمنى أو بعرفات فقال: أنا وهارون هكذا وضم بين إصبعيه فكنا لا ندري ما يعني بذلك؟ حتى كان من أمره بطوس ما كان، فأمر المأمون بدفن الرضا عليه السلام إلى جنب هارون.