It is narrated from Sayyiduna Uthman (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever does a kindness to any of the descendants of Abd al-Muttalib and has not been repaid for it in this world, then it will be upon me to repay him tomorrow, on the Day of Resurrection, when he meets me."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Uthman (may Allah be pleased with him) only with this chain; Yunus bin Nafi' (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 1446
Hadith Gradingمحدثین:إسناده ضعيف لضعف عبد الرحمن بن أبي الزناد
Hadith Takhrij«قال الهيثمي: فيه عبد الرحمن بن أبي الزناد وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 9، ص 173»» «أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 315»