Yahya ibn Yahya al-Tamimi and Muhammad ibn Rumh ibn al-Muhajir narrated to us, both saying: al-Layth informed us. (Another chain:) Qutaybah ibn Sa'id narrated to us, saying: Layth narrated to us, from Ibn Shihab, from Ubayd Allah ibn Abd Allah, from Ibn Abbas, that he said: Sa'd ibn Ubadah asked the Messenger of Allah, peace and blessings be upon him, about a vow that was upon his mother, who had died before fulfilling it. The Messenger of Allah, peace and blessings be upon him, said: "Fulfill it on her behalf."