Sahih Bukhari Volume 2, Book 24, Hadith Number 520.

Narated By ‘Aisha :  The Prophet 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.”