(25) باب أَجْرِ الْخَازِنِ الأَمِينِ وَالْمَرْأَةِ إِذَا تَصَدَّقَتْ مِنْ بَيْتِ زَوْجِهَا غَيْرَ مُفْسِدَةٍ ب
'A'isha reported Allah's Messenger (ﷺ) as saying:
When a woman spends (something as Sadaqa) out of the household of her husband without causing any damage, there is a reward for her and for him too like it for whatever he earned, and for her (for the wife) because of her spending (for the sake of Allah), and for the trustee also (there is a reward like it), without any reduction from their rewards.
Reference: Sahih Muslim 1024 c
In-book reference: Book 12, Hadith 103
USC-MSA web (English) reference(deprecated numbering scheme): Book 5, Hadith 2234