It is narrated from Sayyiduna Sa'd bin 'Ubadah (may Allah be pleased with him) that he came to the Noble Prophet (peace and blessings be upon him) and said: "My mother has passed away, and she had a vow upon her. If I free a slave on her behalf, will this action suffice for her?" The Prophet (peace and blessings be upon him) said: "Free (a slave) on behalf of your mother."