حَدَّثَنَا الْحَسَنُ بْنُ عَلِيٍّ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنْ هَمَّامِ بْنِ مُنَبِّهٍ، قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ، يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِذَا أَنْفَقَتِ الْمَرْأَةُ مِنْ كَسْبِ زَوْجِهَا مِنْ غَيْرِ أَمْرِهِ فَلَهَا نِصْفُ أَجْرِهِ ‏"‏ ‏.‏

Abu Hurairah reported The Messenger of Allah (PBUH) as saying When a woman gives something her husband has earned without being commanded by him to do so, she has half his reward. Translation Not Available

Book Ref: Sunan Abi Dawud Book 9 Hadith 1687
Web Ref:  Sunan Abi Dawud Book 9 Hadith 1683