Language:
كتاب الزكاة
24  
Obligatory Charity Tax (Zakat)
(26)
Chapter: The reward of the lady who gives in charity, from her husband’s house
(26)
باب أَجْرِ الْمَرْأَةِ إِذَا تَصَدَّقَتْ أَوْ أَطْعَمَتْ مِنْ بَيْتِ زَوْجِهَا غَيْرَ مُفْسِدَةٍ
Sahih al-Bukhari 1440

Narrate Aisha:

The Prophet (ﷺ) said, "If a woman gives in charity from her husband's house .." The Prophet (p.b.u.h) also said, "If a lady gives meals (in charity) from her husband's house without spoiling her husband's property, she will get a reward and her husband will also get a reward likewise. The husband will get a reward because of his earnings and the woman because of her spending."

حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، عَنْ شَقِيقٍ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ إِذَا أَطْعَمَتِ الْمَرْأَةُ مِنْ بَيْتِ زَوْجِهَا غَيْرَ مُفْسِدَةٍ، لَهَا أَجْرُهَا، وَلَهُ مِثْلُهُ، وَلِلْخَازِنِ مِثْلُ ذَلِكَ، لَهُ بِمَا اكْتَسَبَ، وَلَهَا بِمَا أَنْفَقَتْ ‏"‏‏.‏
Reference : Sahih al-Bukhari 1440
In-book reference : Book 24, Hadith 43
USC-MSA web (English) reference : Vol. 2, Book 24, Hadith 520
  (deprecated numbering scheme)