Sahih Al Bukhari Hadith Number 1441

Narrated `Aisha: The Prophet (peace be upon him) said, “When a woman gives in charity from her house meals in Allah’s Cause without spoiling her husband’s property, she will get a reward for it, and her husband will also get the reward for his earnings and the storekeeper will get a reward likewise.”

24  Obligatory Charity Tax (Zakat)
Hadith number 1441
Volume no 2
Chapter: 26 (The reward of the lady who gives in charity, from her husband’s house)