Hadithcore
Hadith #2110600

Another wording is:

"It is not permissible for a woman to dispose anything of her wealth if her husband is responsible for her." [Reported by Ahmad and the collectors of as-Sunan except at-Tirmidhi and al-Hakim graded it Sahih (authentic)].

وَفِي لَفْظٍ: { لَا يَجُوزُ لِلْمَرْأَةِ أَمْرٌ فِي مَالِهَا, إِذَا مَلَكَ زَوْجُهَا عِصْمَتَهَا } رَوَاهُ أَحْمَدُ, وَأَصْحَابُ اَلسُّنَنِ إِلَّا اَلتِّرْمِذِيَّ, وَصَحَّحَهُ اَلْحَاكِمُ [1]‏ .‏

References2 variants
Sunnah.com reference
Book 7, Hadith 113
Arabic/English book reference
Book 7, Hadith 0