A man said to the Prophet, "My mother died suddenly, and I think that if she could speak, she would have given in charity. May I give in charity on her behalf?" He said, "Yes! Give in charity on her behalf."  

لِلنَّبِيِّ ﷺ إِنَّ أُمِّي افْتُلِتَتْ نَفْسَهَا وَأُرَاهَا لَوْ تَكَلَّمَتْ تَصَدَّقَتْ أَفَأَتَصَدَّقُ عَنْهَا قَالَ نَعَمْ تَصَدَّقْ عَنْهَا  

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