It is narrated from Sayyiduna Abu Rafi' (may Allah be pleased with him) that he gave the Prophet (peace and blessings be upon him) the good news of the acceptance of Islam by Sayyiduna al-Abbas (may Allah be pleased with him), so the Messenger of Allah (peace and blessings be upon him) set him free.
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Abu Rafi' (may Allah be pleased with him) only with this chain, and Muhammad bin Bakkar is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 2365
Hadith Gradingمحدثین:إسناده حسن
Hadith Takhrij«قال الهيثمي: إسناده حسن «مجمع الزوائد ومنبع الفوائد، ج 9، ص 268»»