Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates from Sayyiduna Sa'd bin Ubadah (may Allah be pleased with him) that he said: "I came to the Messenger of Allah (peace and blessings be upon him) and said: My mother has died; she made no bequest and gave no charity. If I give charity on her behalf, will it be accepted? He (peace and blessings be upon him) said: 'Yes.' He said: Will that benefit her? He (peace and blessings be upon him) said: 'Yes, even if it is only a burnt trotter of a goat.'"
No one narrated this hadith from Muhammad bin Kurayb (may Allah have mercy on him) except Abu Zuhayr (may Allah have mercy on him).
Hadith Referenceالمعجم الأوسط / باب الميم / 7490
Hadith Gradingمحدثین:إسناده ضعيف لضعف محمد بن كريب
Hadith Takhrij«قال الهيثمي: فيه محمد بن كريب وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 3، ص 138»» «أخرجه الطبراني فى «الكبير» برقم: 5380»