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  

The Prophet ﷺ forbade vowing and said, "In fact, vowing does not prevent anything, but it makes a miser to spend his property."  

نَهَى النَّبِيُّ ﷺ عَنِ النَّذْرِ قَالَ إِنَّهُ لاَ يَرُدُّ شَيْئًا وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ  

The Prophet ﷺ said, "Allah says, 'The vow, does not bring about for the son of Adam anything I have not decreed for him, but his vow may coincide with what has been decided for him, and by this way I cause a miser to spend of his wealth. So he gives Me (spends in charity) for the fulfillment of what has been decreed for him what he would not give Me before but for his vow."  

قَالَ النَّبِيُّ ﷺ لاَ يَأْتِي ابْنَ آدَمَ النَّذْرُ بِشَىْءٍ لَمْ يَكُنْ قُدِّرَ لَهُ وَلَكِنْ يُلْقِيهِ النَّذْرُ إِلَى الْقَدَرِ قَدْ قُدِّرَ لَهُ فَيَسْتَخْرِجُ اللَّهُ بِهِ مِنَ الْبَخِيلِ فَيُؤْتِي عَلَيْهِ مَا لَمْ يَكُنْ يُؤْتِي عَلَيْهِ مِنْ قَبْلُ  

The Prophet ﷺ saw an old man walking, supported by his two sons, and asked about him. The people informed him that he had vowed to go on foot (to the Kaʿba). He said, "Allah is not in need of this old man's torturing himself," and ordered him to ride.  

أَنَّ النَّبِيَّ ﷺ رَأَى شَيْخًا يُهَادَى بَيْنَ ابْنَيْهِ قَالَ مَا بَالُ هَذَا قَالُوا نَذَرَ أَنْ يَمْشِيَ قَالَ إِنَّ اللَّهَ عَنْ تَعْذِيبِ هَذَا نَفْسَهُ لَغَنِيٌّ وَأَمَرَهُ أَنْ يَرْكَبَ  

My sister vowed to go on foot to the Kaʿba, and she asked me to take the verdict of the Prophet ﷺ about it. So, I did and the Prophet ﷺ said, "She should walk and also should ride." Narrated Abul-Khair from ʿUqba as above.:  

نَذَرَتْ أُخْتِي أَنْ تَمْشِيَ إِلَى بَيْتِ اللَّهِ وَأَمَرَتْنِي أَنْ أَسْتَفْتِيَ لَهَا النَّبِيَّ ﷺ فَاسْتَفْتَيْتُهُ فَقَالَ عَلَيْهِ السَّلاَمُ لِتَمْشِ وَلْتَرْكَبْ قَالَ وَكَانَ أَبُو الْخَيْرِ لاَ يُفَارِقُ عُقْبَةَ