Fulfil it on her behalf.  

أَنَّهُ قَالَ اسْتَفْتَى سَعْدُ بْنُ عُبَادَةَ رَسُولَ اللَّهِ ﷺ فِي نَذْرٍ كَانَ عَلَى أُمِّهِ تُوُفِّيَتْ قَبْلَ أَنْ تَقْضِيَهُ قَالَ رَسُولُ اللَّهِ ﷺ فَاقْضِهِ عَنْهَا  

This hadith has been narrated on the authority of Zuhri with a different chains of transmitters.  

عَنِ الزُّهْرِيِّ بِإِسْنَادِ اللَّيْثِ وَمَعْنَى حَدِيثِهِ  

Messenger of Allah (may peace he upon him) singled out one day forbidding us to take vows and said: It would not avert anything; it is by which something is extracted from the miserly person.  

أَخَذَ رَسُولُ اللَّهِ ﷺ يَوْمًا يَنْهَانَا عَنِ النَّذْرِ وَيَقُولُ إِنَّهُ لاَ يَرُدُّ شَيْئًا وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الشَّحِيحِ  

The vow neither hastens anything nor defers anything, but is the means whereby (something) is extracted from the miserly person.  

عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ النَّذْرُ لاَ يُقَدِّمُ شَيْئًا وَلاَ يُؤَخِّرُهُ وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ  

It does not (necessarily) bring good (in the form of substantial, and tangible results), but it is the meant whereby something is extracted from the miserly persons.  

عَنِ النَّبِيِّ ﷺ أَنَّهُ نَهَى عَنِ النَّذْرِ وَقَالَ إِنَّهُ لاَ يَأْتِي بِخَيْرٍ وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ  

This hadith has been narrated on the authority of Mansur with the same chain of transmitters.  

عَنْ مَنْصُورٍ بِهَذَا الإِسْنَادِ نَحْوَ حَدِيثِ جَرِيرٍ  

Do not take vows, for a vow has no effect against Fate; it is only from the miserly that something is extracted.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ تَنْذُرُوا فَإِنَّ النَّذْرَ لاَ يُغْنِي مِنَ الْقَدَرِ شَيْئًا وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ  

It does not avert Fate, but is the means by which something is extracted from the miser.  

عَنِ النَّبِيِّ ﷺ أَنَّهُ نَهَى عَنِ النَّذْرِ وَقَالَ إِنَّهُ لاَ يَرُدُّ مِنَ الْقَدَرِ وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ  

The vow does not bring anything near to the son of Adam which Allah has not ordained for him, but (at times) the vow coincides with Destiny, and this is how something is extracted from the miserly person, which that miser was not willing to give.  

أَنَّ النَّبِيَّ ﷺ قَالَ إِنَّ النَّذْرَ لاَ يُقَرِّبُ مِنِ ابْنِ آدَمَ شَيْئًا لَمْ يَكُنِ اللَّهُ قَدَّرَهُ لَهُ وَلَكِنِ النَّذْرُ يُوَافِقُ الْقَدَرَ فَيُخْرَجُ بِذَلِكَ مِنَ الْبَخِيلِ مَا لَمْ يَكُنِ الْبَخِيلُ يُرِيدُ أَنْ يُخْرِجَ  

This hadith has been transmitted on the authority of 'Amr b. Abu 'Amr.  

عَنْ عَمْرِو بْنِ أَبِي عَمْرٍو بِهَذَا الإِسْنَادِ مِثْلَهُ  

Muhammad. He came near him and said: What is the matter with you? Thereupon he (the prisoner) said: Why have you taken me as prisoner and why have you caught hold of one proceeding the pilgrims (the she-camel as she carried the Prophet on her back and walked ahead of the multitude)? He (the Holy Prophet) said: (Yours is a great fault). I (my men) have caught hold of you for the crime of your allies, Banu Thaqif. He (the Holy Prophet) then turned away. He again called him and said: Muhammad, Muhammad, and since Messenger of Allah ﷺ was very compassionate, and tenderhearted, he returned to him, and said: What is the matter with you? He said: I am a Muslim, whereupon he (the Holy Prophet) said: Had you said this when you had been the master of yourself, you would have gained every success. He then turned away. He (the prisoner) called him again saying: Muhammad, Muhammad. He came to him and said: What is the matter with you? He said: I am hungry, feed me, and I am thirsty, so provide me with drink. He (the Holy Prophet) said: That is (to satisfy) your want. He was then ransomed for two persons (who had been taken prisoner by Thaqif). He (the narrator) said: A woman of the Ansar had been taken prisoner and also al-Adbi' was caught. The woman had been tied with ropes. The people were giving rest to their animals before their houses. She escaped one night from the bondage and came to the camels. As she drew near the camels, they fretted and fumed and so she left them until she came to al-, Adbi'. It did not fret and fume; it was docile She rode upon its back and drove it away and she went off. When they (the enemies of Islam) were warned of this, they went in search of it, but it (the she-camel) exhausted them. She (the woman) took vow for Allah, that in case He would save her through it, she would offer that as a sacrifice. As she reached Medina, the people saw her and they said: Here is al-Adbi, the she-camel of Messenger of Allah ﷺ. She (the woman) said that she had taken a vow that if Allah would save her on its back, she would sacrifice it. They (the Prophet's Companions) came to Messenger of Allah ﷺ and made a mention of that to him, whereupon he said: Hallowed be Allah, how ill she rewarded it that she took vow to Allah that if He saves her on its back, she would sacrifice it! There is no fulfillment of the vow in an act of disobedience, nor in an act over which a person has no control. In the version of Ibn Hujr (the words are):" There is no vow in disobedience to Allah."  

كَانَتْ ثَقِيفُ حُلَفَاءَ لِبَنِي عُقَيْلٍ فَأَسَرَتْ ثَقِيفُ رَجُلَيْنِ مِنْ أَصْحَابِ رَسُولِ اللَّهِ ﷺ وَأَسَرَ أَصْحَابُ رَسُولِ اللَّهِ ﷺ رَجُلاً مِنْ بَنِي عُقَيْلٍ وَأَصَابُوا مَعَهُ الْعَضْبَاءَ فَأَتَى عَلَيْهِ رَسُولُ اللَّهِ ﷺ وَهْوَ فِي الْوَثَاقِ قَالَ يَا مُحَمَّدُ فَأَتَاهُ فَقَالَ مَا شَأْنُكَ فَقَالَ بِمَ أَخَذْتَنِي وَبِمَ أَخَذْتَ سَابِقَةَ الْحَاجِّ فَقَالَ إِعْظَامًا لِذَلِكَ أَخَذْتُكَ بِجَرِيرَةِ حُلَفَائِكَ ثَقِيفَ ثُمَّ انْصَرَفَ عَنْهُ فَنَادَاهُ فَقَالَ يَا مُحَمَّدُ يَا مُحَمَّدُ وَكَانَ رَسُولُ اللَّهِ ﷺ رَحِيمًا رَقِيقًا فَرَجَعَ إِلَيْهِ فَقَالَ مَا شَأْنُكَ قَالَ إِنِّي مُسْلِمٌ قَالَ لَوْ قُلْتَهَا وَأَنْتَ تَمْلِكُ أَمْرَكَ أَفْلَحْتَ كُلَّ الْفَلاَحِ ثُمَّ انْصَرَفَ فَنَادَاهُ فَقَالَ يَا مُحَمَّدُ يَا مُحَمَّدُ فَأَتَاهُ فَقَالَ مَا شَأْنُكَ قَالَ إِنِّي جَائِعٌ فَأَطْعِمْنِي وَظَمْآنُ فَأَسْقِنِي قَالَ هَذِهِ حَاجَتُكَ فَفُدِيَ بِالرَّجُلَيْنِ قَالَ وَأُسِرَتِ امْرَأَةٌ مِنَ الأَنْصَارِ وَأُصِيبَتِ الْعَضْبَاءُ فَكَانَتِ الْمَرْأَةُ فِي الْوَثَاقِ وَكَانَ الْقَوْمُ يُرِيحُونَ نَعَمَهُمْ بَيْنَ يَدَىْ بُيُوتِهِمْ فَانْفَلَتَتْ ذَاتَ لَيْلَةٍ مِنَ الْوَثَاقِ فَأَتَتِ الإِبِلَ فَجَعَلَتْ إِذَا دَنَتْ مِنَ الْبَعِيرِ رَغَا فَتَتْرُكُهُ حَتَّى تَنْتَهِيَ إِلَى الْعَضْبَاءِ فَلَمْ تَرْغُ قَالَ وَنَاقَةٌ مُنَوَّقَةٌ فَقَعَدَتْ فِي عَجُزِهَا ثُمَّ زَجَرَتْهَا فَانْطَلَقَتْ وَنَذِرُوا بِهَا فَطَلَبُوهَا فَأَعْجَزَتْهُمْ قَالَ وَنَذَرَتْ لِلَّهِ إِنْ نَجَّاهَا اللَّهُ عَلَيْهَا لَتَنْحَرَنَّهَا فَلَمَّا قَدِمَتِ الْمَدِينَةَ رَآهَا النَّاسُ فَقَالُوا الْعَضْبَاءُ نَاقَةُ رَسُولِ اللَّهِ ﷺ فَقَالَتْ إِنَّهَا نَذَرَتْ إِنْ نَجَّاهَا اللَّهُ عَلَيْهَا لَتَنْحَرَنَّهَا فَأَتَوْا رَسُولَ اللَّهِ ﷺ فَذَكَرُوا ذَلِكَ لَهُ فَقَالَ سُبْحَانَ اللَّهِ بِئْسَمَا جَزَتْهَا نَذَرَتْ لِلَّهِ إِنْ نَجَّاهَا اللَّهُ عَلَيْهَا لَتَنْحَرَنَّهَا لاَ وَفَاءَ لِنَذْرٍ فِي مَعْصِيَةٍ وَلاَ فِيمَا لاَ يَمْلِكُ الْعَبْدُ وَفِي رِوَايَةِ ابْنِ حُجْرٍ لاَ نَذْرَ فِي مَعْصِيَةِ اللَّهِ  

This hadith is narrated on the authority of Ayyub with the same chain of transmitters and a slight variation of words.  

عَنْ أَيُّوبَ بِهَذَا الإِسْنَادِ نَحْوَهُ وَفِي حَدِيثِ حَمَّادٍ قَالَ كَانَتِ الْعَضْبَاءُ لِرَجُلٍ مِنْ بَنِي عُقَيْلٍ وَكَانَتْ مِنْ سَوَابِقِ الْحَاجِّ وَفِي حَدِيثِهِ أَيْضًا فَأَتَتْ عَلَى نَاقِةٍ ذَلُولٍ مُجَرَّسَةٍ وَفِي حَدِيثِ الثَّقَفِيِّ وَهِيَ نَاقَةٌ مُدَرَّبَةٌ  

What is the matter with him? They said: He had taken the vow to walk (on foot to the Ka'ba). Thereupon he (Allah's Apoitle) said: Allah is indifferent to his inflicting upon himself chastisement, and he commanded him to ride.  

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

Allah's Apostle ﷺ found an old man walking between his two sons supported by them, whereupon Allah's Apostle ﷺ said: What is the matter with him? He (the narrator) said: Messenger of Allah, they are his sons and there is upon him the (fulfilment) of the vow, whereupon Allah's Apostle ﷺ said: Ride, old man, for Allah is not in need of you and your vow.  

أَنَّ النَّبِيَّ ﷺ أَدْرَكَ شَيْخًا يَمْشِي بَيْنَ ابْنَيْهِ يَتَوَكَّأُ عَلَيْهِمَا فَقَالَ النَّبِيُّ ﷺ مَا شَأْنُ هَذَا قَالَ ابْنَاهُ يَا رَسُولَ اللَّهِ كَانَ عَلَيْهِ نَذْرٌ فَقَالَ النَّبِيُّ ﷺ ارْكَبْ أَيُّهَا الشَّيْخُ فَإِنَّ اللَّهَ غَنِيٌّ عَنْكَ وَعَنْ نَذْرِكَ وَاللَّفْظُ لِقُتَيْبَةَ وَابْنِ حُجْرٍ  

This hadith has been narrated on the authority of 'Amr b. Abu 'Amr with the same chain of transmitters.  

عَنْ عَمْرِو بْنِ أَبِي عَمْرٍو بِهَذَا الإِسْنَادِ مِثْلَهُ  

My sister took a vow that she would walk bare foot to the house of Allah (Ka'ba). She asked me to inquire from Messenger of Allah ﷺ about it. I sought his decision and he said: She should walk on foot and ride also.  

أَنْ تَمْشِيَ إِلَى بَيْتِ اللَّهِ حَافِيَةً فَأَمَرَتْنِي أَنْ أَسْتَفْتِيَ لَهَا رَسُولَ اللَّهِ ﷺ فَاسْتَفْتَيْتُهُ فَقَالَ لِتَمْشِ وَلْتَرْكَبْ  

This hadith has been narrated on the authority of 'Uqba b. Amir Juhani. but in this no mention has been made of" barefoot".  

أَخْبَرَهُ بِهَذَا الإِسْنَادِ مِثْلَ حَدِيثِ عَبْدِ الرَّزَّاقِ  

The expiation of the (breach of) a vow is the same as that of the (breach of an oath).  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ كَفَّارَةُ النَّذْرِ كَفَّارَةُ الْيَمِينِ