Hadith 6:1281
Ibn ‘Uyaynah narrated to us, from al-Zuhri, from ‘Ubayd Allah, from Ibn ‘Abbas, that Sa‘d ibn ‘Ubadah asked the Prophet, may Allah bless him and grant him peace, for a legal opinion regarding a vow that was upon his mother who had died before she could fulfill it. He said: "Fulfill it on her behalf."
حدثنا بن عيينة عن الزهري عن عبيد الله عن بن عباس أن سعد بن عبادة استفتى النبي صلى الله عليه وسلم في نذر كان على امه توفيت قبل أن تقضيه فقال اقضه عنها