Sahih al-Bukhari 1437
Narrated `Aisha:
Allah's Messenger (ﷺ) said, "When a woman gives in charity from her husband's meals without wasting the 
property of her husband, she will get a reward for it, and her husband too will get a reward for what he 
earned and the storekeeper will have the reward likewise."
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، عَنْ أَبِي وَائِلٍ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ إِذَا تَصَدَّقَتِ الْمَرْأَةُ مِنْ طَعَامِ زَوْجِهَا غَيْرَ مُفْسِدَةٍ كَانَ لَهَا أَجْرُهَا، وَلِزَوْجِهَا بِمَا كَسَبَ، وَلِلْخَازِنِ مِثْلُ ذَلِكَ ‏"‏‏.‏