Musannaf Ibn Abi Shayba 13:2119

Abu Bakr narrated to us, he said: Ibn Abi Za'ida and Abu Mu'awiya narrated to us, from al-A'mash, from Shaqiq, from Masruq, from 'Aisha, she said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "If a woman spends from her husband's house, she has her reward, and he has the like of it for what he earned, and she has [the reward] for what she spent. And the treasurer has the like of that." Abu Mu'awiya added: "Without any of their rewards being diminished in the slightest."