The Prophet ﷺ said, "If the wife gives of her husband's property (something in charity) without his permission, he will get half the reward."

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا أَنْفَقَتِ الْمَرْأَةُ مِنْ كَسْبِ زَوْجِهَا عَنْ غَيْرِ أَمْرِهِ فَلَهُ نِصْفُ أَجْرِهِ