Musnad Ahmad

It is narrated from Hazrat Sa'd bin Ubadah (may Allah be pleased with him) that his mother passed away, so he submitted to the Holy Prophet (peace and blessings be upon him), "O Messenger of Allah! My mother has passed away. Can I give charity on her behalf?" The Holy Prophet (peace and blessings be upon him) said, "Yes!" He asked, "Then which charity is the best?" The Holy Prophet (peace and blessings be upon him) said, "Providing water." The narrator says that this is the real reason for the family of Sa'd providing water in Madinah Munawwarah.

It is narrated from Hazrat Sa'd bin Ubadah (may Allah be pleased with him) that once he presented himself before the Noble Prophet (peace and blessings be upon him) and said, "My mother has passed away. She had made a vow. Will it suffice if I free a slave on her behalf?" The Noble Prophet (peace and blessings be upon him) said, "You can free a slave on behalf of your mother."

It is narrated from Hazrat Sa'd bin 'Ubadah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "This tribe of the Ansar is a trial; love for them is a sign of faith and hatred for them is a sign of hypocrisy."