It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that he said: Sayyiduna Sa’d bin Ubadah (may Allah be pleased with him) asked the Messenger of Allah (peace and blessings be upon him) about a matter, saying, "My mother had made a vow, but she passed away before fulfilling it." The Prophet (peace and blessings be upon him) said, "Fulfill it on her behalf."