"My mother has died and she had a vow to fulfill. Will it suffice if I free a slave on her behalf?" He said: "Free a slave on behalf of your mother." (Using translation from Nasāʾī 3656)
يَا رَسُولَ اللهِ إِنَّ أُمِّي مَاتَتْ وَعَلَيْهَا نَذْرٌ فَيُجْزِئُ عَنْهَا أَنْ أَعْتِقَ عَنْهَا؟ قَالَ «أَعْتِقْ عَنْ أُمِّكَ»