مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1892
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas that Sa‘d bin "Ubadah asked the Prophet (ﷺ) about a vow that his mother had made, but she had died before she fulfilled it. He said: "Fulfil it on her behalf.”
Musnad Ahmad 1893Sahih (Darussalam) [ al-Bukhari (2761) and Muslim (1638)]