It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that Sayyiduna Sa'd bin Ubadah (may Allah be pleased with him) sought a ruling from the Messenger of Allah (peace and blessings be upon him) about a vow that his mother owed, and she had died before fulfilling it. So the Messenger of Allah (peace and blessings be upon him) gave him the ruling that he should fulfil it.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5355