Language:
كتاب النفقات
69  
Supporting the Family
(4)
Chapter: The expenditure of a woman and her child, whose husband is away from her
(4)
باب نَفَقَةِ الْمَرْأَةِ إِذَا غَابَ عَنْهَا زَوْجُهَا وَنَفَقَةِ الْوَلَدِ
Sahih al-Bukhari 5360

Narrated Abu Huraira:

The Prophet (ﷺ) said, "If the wife gives of her husband's property (something in charity) without his permission, he will get half the reward."

حَدَّثَنَا يَحْيَى، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، عَنْ مَعْمَرٍ، عَنْ هَمَّامٍ، قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ إِذَا أَنْفَقَتِ الْمَرْأَةُ مِنْ كَسْبِ زَوْجِهَا عَنْ غَيْرِ أَمْرِهِ فَلَهُ نِصْفُ أَجْرِهِ ‏"‏‏.‏
Reference : Sahih al-Bukhari 5360
In-book reference : Book 69, Hadith 10
USC-MSA web (English) reference : Vol. 7, Book 64, Hadith 273
  (deprecated numbering scheme)