Abdullah bin Ahmad bin Hanbal says: Ali bin Aththam bin Ali mentioned (Abdullah bin Ahmad says: and I have seen Ali bin Aththam) that his father narrated to him from al-A'mash, from Amr bin Murrah, from Abu Nasr, that is Humayd bin Hilal, from Abdullah bin al-Samit, from Sayyiduna Abu Dharr (may Allah be pleased with him), from the Prophet (peace and blessings be upon him), a hadith about Abu Dharr's (may Allah be pleased with him) acceptance of Islam; then the narrator mentioned that hadith.
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1626