Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: Sayyiduna Sa’d bin Ubadah (may Allah be pleased with him) asked the Prophet (peace and blessings be upon him) about an issue: He said, "My mother has passed away and she had a vow upon her which she did not fulfill." So the Prophet (peace and blessings be upon him) said, "Fulfill it on her behalf."