Fulfill promises/vows/obligations even after death; free slaves as an act of charity; show mercy and kindness towards those in need or distress; give advice without any financial burden being placed upon family members.

This hadith speaks about fulfilling vows and the importance of freeing slaves. It was narrated from Sa'd bin 'Ubadah that he came to the Prophet and said that his mother has passed away with an unfulfilled vow. The Prophet advised him to free a slave on her behalf as an act of fulfilling her vow. This hadith teaches us the importance of fulfilling our promises and obligations even after death. It also shows us how freeing slaves is considered an act of charity in Islam which can be used for atonement or for fulfilling vows made by someone else. Furthermore, it highlights the mercy and kindness shown by the Prophet towards those in need or distress as he gave advice on how to fulfill this obligation without any financial burden being placed upon Sa'd bin 'Ubadah's family.