Musnad Ahmad 1153:162

Abu Mu'awiyah and Ibn Numayr narrated to us, they said: Al-A'mash narrated to us, from Shaqiq, from Masruq, from 'Aishah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "If she spends..." Ibn Numayr said: "If a woman feeds from her husband's house." Abu Mu'awiyah said: "If a woman spends from her husband's house without being wasteful, she has her reward, and he has the like of that for what he earned, and she has [the reward] for what she spent, and the treasurer has the like of that." Abu Mu'awiyah said: "Without any of their rewards being diminished in the slightest."