Sahih al-Bukhari 2066
Sahih al-Bukhari · Book 34: Sales and Trade · Allah's Statement: "... Spend of the good things which you have earned ..."
Narrated Abu Huraira:
حَدَّثَنِي يَحْيَى بْنُ جَعْفَرٍ ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ ، عَنْ مَعْمَرٍ ، عَنْ هَمَّامٍ ، قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِذَا أَنْفَقَتِ الْمَرْأَةُ مِنْ كَسْبِ زَوْجِهَا عَنْ غَيْرِ أَمْرِهِ، فَلَهُ نِصْفُ أَجْرِهِ " .
The Prophet (ﷺ) said, "If a woman gives something (i.e. in charity) from her husband's earnings without his permission, she will get half his reward."