"I made a vow during the Ignorance period and I asked the Prophet ﷺ (about it) after I became Muslim. He told me to fulfill my vow."  

نَذَرْتُ نَذْرًا فِي الْجَاهِلِيَّةِ فَسَأَلْتُ النَّبِيَّ ﷺ بَعْدَ مَا أَسْلَمْتُ فَأَمَرَنِي أَنْ أُوفِيَ بِنَذْرِي  

"O Messenger of Allah, I vowed to offer a sacrifice at Buwanah." He said: "Do you intend any action of Ignorance period?" He said: "No." He said: "Then fulfill your vow."  

أَنَّ رَجُلاً جَاءَ إِلَى النَّبِيِّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ إِنِّي نَذَرْتُ أَنْ أَنْحَرَ بِبُوَانَةَ فَقَالَ فِي نَفْسِكَ شَىْءٌ مِنْ أَمْرِ الْجَاهِلِيَّةِ قَالَ لاَ قَالَ أَوْفِ بِنَذْرِكَ  

her father met the Prophet ﷺ when she was riding behind him. He said: "I vowed to offer a sacrifice at Buwanah." The Messenger of Allah ﷺ said: "Is there any idol there?" He said: "No." He said: " Fulfill your vow." (Hasan)Another chain with similar wording.  

أَنَّ أَبَاهَا لَقِيَ النَّبِيَّ ﷺ وَهِيَ رَدِيفَةٌ لَهُ فَقَالَ إِنِّي نَذَرْتُ أَنْ أَنْحَرَ بِبُوَانَةَ فَقَالَ رَسُولُ اللَّهِ ﷺ هَلْ بِهَا وَثَنٌ قَالَ لاَ قَالَ أَوْفِ بِنَذْرِكَ حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا ابْنُ دُكَيْنٍ عَنْ عَبْدِ اللَّهِ بْنِ عَبْدِ الرَّحْمَنِ عَنْ يَزِيدَ بْنِ مِقْسَمٍ عَنْ مَيْمُونَةَ بِنْتِ كَرْدَمٍ عَنِ النَّبِيِّ ﷺ بِنَحْوِهِ