Keep your promises and commitments even if they are difficult or inconvenient for you. Respect your parents' wishes even after they have passed away.

This hadith is about fulfilling a vow after the death of the person who made it. Sa'd asked the Prophet Muhammad for advice on what to do with a vow his mother had made but hadn't fulfilled before she passed away. The Prophet Muhammad advised him to fulfill it on her behalf, showing that even after someone has died, their promises should still be kept and respected. This teaches us that we should always strive to keep our promises and commitments, even if they are difficult or inconvenient for us. It also shows us how important it is to respect our parents and honor their wishes, even after they have passed away.