Saʿd bin Ubada consulted Messenger of Allah ﷺ saying, "My mother died and she had an unfulfilled vow." The Prophet ﷺ said, "Fulfill it on her behalf."  

أَنَّ سَعْدَ بْنَ عُبَادَةَ ؓ اسْتَفْتَى رَسُولَ اللَّهِ ﷺ فَقَالَ إِنَّ أُمِّي مَاتَتْ وَعَلَيْهَا نَذْرٌ فَقَالَ اقْضِهِ عَنْهَا