Sahih Al Bukhari Hadith Number 2066

Narrated Abu Huraira: The Prophet (peace be upon him) said, “If a woman gives something (i.e. in charity) from her husband’s earnings without his permission, she will get half his reward.”

34  Sales and Trade
Hadith number 2066
Volume no 3
Chapter: 12 (Allah’s Statement: “… Spend of the good things which you have earned …”)