Narrated Abu Huraira: The Prophet said, "If a woman gives something (i.e. in charity) from her husband's earnings without his permission, she will get half his reward."
Hadith ReferenceSahih Bukhari / The Book of Sales (Bargains) / Hadith: 2066
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة