It is narrated from Sayyiduna al-Hasan bin Ali bin Abi Talib (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Have regard for me in the matter of al-Abbas (protect his rights), for he is the remnant (the living memorial) of my forefathers."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna al-Hasan bin Ali (may Allah be pleased with them both) only with this chain."
Hadith Referenceالمعجم الأوسط / باب العين / 4209
Hadith Gradingمحدثین:فيه جماعة لم يعرفهم الهيثمي
Hadith Takhrij«قال الهيثمي: فيه جماعة لم أعرفهم «مجمع الزوائد ومنبع الفوائد، ج 9، ص 269»» «أخرجه الطبراني فى «الصغير» برقم: 572»