There is no fulfillment of a vow that involves disobedience towards Allah, or a vow concerning that which a person does not own

Sahih Muslim · Book 26 · Hadith 1641 a

وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، وَعَلِيُّ بْنُ حُجْرٍ السَّعْدِيُّ، - وَاللَّفْظُ لِزُهَيْرٍ - قَالاَ حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا أَيُّوبُ، عَنْ أَبِي قِلاَبَةَ، عَنْ أَبِي الْمُهَلَّبِ، عَنْ عِمْرَانَ بْنِ حُصَيْنٍ، قَالَ كَانَتْ ثَقِيفُ حُلَفَاءَ لِبَنِي عُقَيْلٍ فَأَسَرَتْ ثَقِيفُ رَجُلَيْنِ مِنْ أَصْحَابِ رَسُولِ اللَّهِ صلى …

Imran b. Husain reported that the tribe of Thaqif was the ally of Banu 'Uqail. Thaqif took two persons from amongst the Companions of Allah's Messenger (ﷺ) as prisoners. The Companions of Allah's Messenger (ﷺ) took one p…