It was narrated from Ibn 'Abbas that Sa'd bin 'Ubadah asked the Messenger of Allah about a vow which his mother had sworn, but she died before she could fulfill it. He said:
"Fulfill it on her behalf."
Reference: Sunan an-Nasa'i 3817 In-book : Book 35, Hadith 57 English translation : Vol. 4, Book 35, Hadith 3848
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