In the time of the Prophet ﷺ a man took a vow to slaughter a camel at Buwanah. So he came to the Prophet ﷺ and said: I have taken a vow to sacrifice a camel at Buwanah. The Prophet ﷺ asked: Did the place contain any idol worshipped in pre-Islamic times? They (the people) said: No. He asked: Was any pre-Islamic festival observed there? They replied: No. The Prophet ﷺ said: Fulfil your vow, for a vow to do an act of disobedience to Allah must not be fulfilled, neither must one do something over which a human being has no control.

نَذَرَ رَجُلٌ عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ أَنْ يَنْحَرَ إِبِلاً بِبُوَانَةَ فَأَتَى النَّبِيَّ ﷺ فَقَالَ إِنِّي نَذَرْتُ أَنْ أَنْحَرَ إِبِلاً بِبُوَانَةَ فَقَالَ النَّبِيُّ ﷺ هَلْ كَانَ فِيهَا وَثَنٌ مِنْ أَوْثَانِ الْجَاهِلِيَّةِ يُعْبَدُ قَالُوا لاَ قَالَ هَلْ كَانَ فِيهَا عِيدٌ مِنْ أَعْيَادِهِمْ قَالُوا لاَ قَالَ رَسُولُ اللَّهِ ﷺ أَوْفِ بِنَذْرِكَ فَإِنَّهُ لاَ وَفَاءَ لِنَذْرٍ فِي مَعْصِيَةِ اللَّهِ وَلاَ فِيمَا لاَ يَمْلِكُ ابْنُ آدَمَ

[Machine] Kardam ibn Sufyan al-Thaqafi came to the Messenger of Allah, ﷺ , and said, "O Messenger of Allah, I have vowed to sacrifice 100 camels in Buwana." The Messenger of Allah, ﷺ , asked him, "On a pagan altar?" Kardam replied, "No." The Prophet, ﷺ , then asked, "On a gathering of people from the time of ignorance?" Kardam replied, "No." The Prophet, ﷺ , then said, "Fulfill your vow wherever it was, O Kardam, for there is no vow or oath in disobedience to Allah."

أَنَّ كَرْدَمَ بْنَ سُفْيَانَ الثَّقَفِيَّ أَتَى رَسُولَ اللهِ ﷺ فَقَالَ يَا رَسُولَ اللهِ إِنِّي نَذَرْتُ أَنْ أَنْحَرَ ذُودَ إِبِلٍ بِبُوَانَةَ فَقَالَ لَهُ رَسُولُ اللهِ ﷺ «عَلَى وَثَنٍ؟» فَقَالَ لَا فَقَالَ «أَعَلَى جَمَعٍ مِنْ جُمُوعِ الْجَاهِلِيَّةِ؟» قَالَ لَا قَالَ «أَوْفِ بِنَذْرِكَ حَيْثُ كَانَ يَا كَرْدَمُ إِنَّهُ لَا نَذْرَ وَلَا يَمِينَ فِي مَعْصِيَةِ اللهِ»